added material presets by Narasimhan et al.
Wenzel Jakob
parent
6b01d20b10
commit
48e92bf900
12
doc/main.bib
12
doc/main.bib
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@ -542,3 +542,15 @@
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address = {New York, NY, USA},
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}
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@article{Narasimhan2006Acquiring,
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author = {Narasimhan, Srinivasa G. and Gupta, Mohit and Donner, Craig and Ramamoorthi, Ravi and Nayar, Shree K. and Jensen, Henrik Wann},
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title = {Acquiring scattering properties of participating media by dilution},
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journal = {ACM Trans. Graph.},
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volume = {25},
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number = {3},
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month = jul,
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year = {2006},
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pages = {1003--1012},
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publisher = {ACM},
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address = {New York, NY, USA}
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}
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@ -114,8 +114,9 @@ MTS_NAMESPACE_BEGIN
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class HanrahanKrueger : public BSDF {
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public:
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HanrahanKrueger(const Properties &props) : BSDF(props) {
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Spectrum sigmaS, sigmaA;
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lookupMaterial(props, sigmaS, sigmaA, NULL);
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Spectrum sigmaS, sigmaA, g;
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lookupMaterial(props, sigmaS, sigmaA, g, NULL);
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sigmaS *= Spectrum(1.0f) - g;
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/* Scattering coefficient of the layer */
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m_sigmaS = new ConstantSpectrumTexture(
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@ -26,7 +26,13 @@ MTS_NAMESPACE_BEGIN
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Medium::Medium(const Properties &props)
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: NetworkedObject(props) {
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lookupMaterial(props, m_sigmaS, m_sigmaA);
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Spectrum g;
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lookupMaterial(props, m_sigmaS, m_sigmaA, g);
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/* For now, ignore the anisotropy information of preset materials
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and use the reduced scattering coefficient */
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m_sigmaS *= Spectrum(1.0f) - g;
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m_sigmaT = m_sigmaA + m_sigmaS;
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}
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@ -104,7 +104,7 @@ void ShapeKDTree::build() {
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}
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}
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Log(EDebug, "Finished -- took %i ms.", timer->getMilliseconds());
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Log(EDebug, "");
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Log(m_logLevel, "");
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KDAssert(idx == primCount);
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#endif
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}
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@ -99,27 +99,41 @@ MTS_NAMESPACE_BEGIN
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*
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* \begin{table}[h!]
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* \centering
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* \begin{tabular}{>{\ttfamily}p{2cm}p{.8cm}>{\ttfamily}p{2cm}}
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* \vspace{3mm}
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* {\footnotesize
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* \begin{tabular}{>{\ttfamily}p{3.8cm}p{.4cm}>{\ttfamily}p{3.8cm}p{.4cm}>{\ttfamily}p{3.8cm}}
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* \toprule
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* \rmfamily \textbf{Name} &&
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* \rmfamily \textbf{Name} \\
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* \cmidrule{1-1} \cmidrule{3-3}
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* apple&&potato\\
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* chicken1&&skimmilk\\
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* chicken2&&skin1\\
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* cream&&skin2\\
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* ketchup&&spectralon\\
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* marble&&wholemilk\\
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* \rmfamily \small\textbf{Name} &&
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* \rmfamily \small\textbf{Name} &&
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* \rmfamily \small\textbf{Name} \\
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* \cmidrule{1-1} \cmidrule{3-3} \cmidrule{5-5}
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* Apple && Chicken1 && Chicken2 \\
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* Cream && Ketchup && Potato \\
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* Skimmilk && Skin1 && Skin2 \\
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* Spectralon && Wholemilk && \\
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* \cmidrule{1-1} \cmidrule{3-3} \cmidrule{5-5}
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* Lowfat Milk && Gatorade && White Grapefruit Juice \\
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* Reduced Milk && Chardonnay && Shampoo \\
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* Regular Milk && White Zinfandel && Strawberry Shampoo \\
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* Espresso && Merlot && \mbox{Head \& Shoulders Shampoo} \\
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* Mint Mocha Coffee && Budweiser Beer && Lemon Tea Powder \\
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* Lowfat Soy Milk && Coors Light Beer && Orange Juice Powder \\
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* Regular Soy Milk && Clorox && Pink Lemonade Powder \\
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* Lowfat Chocolate Milk && Apple Juice && Cappuccino Powder \\
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* Regular Chocolate Milk && Cranberry Juice && Salt Powder \\
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* Coke && Grape Juice && Sugar Powder \\
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* Pepsi && Ruby Grapefruit Juice && Suisse Mocha \\
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* Sprite && && \\
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* \bottomrule
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* \end{tabular}
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* \caption{
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* \label{tbl:medium-coefficients}
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* This table lists all supported medium material presets. The
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* values are from Jensen et al. \cite{Jensen2001Practical} using
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* units of $\frac{1}{mm}$, so remember to set
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* \end{tabular}}
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* \caption{\label{tbl:medium-coefficients}This
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* table lists all supported medium material presets. The
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* top entries are from Jensen et al. \cite{Jensen2001Practical}, and the
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* bottom ones are from Narasimhan et al. \cite{Narasimhan2006Acquiring}.
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* They all use units of $\frac{1}{mm}$, so remember to set
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* \code{scale} appropriately when your scene is not
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* in units of millimeters.
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* These material names can be used with the plugins
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* These material presets can be used with the plugins
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* \pluginref{homogeneous},\
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* \pluginref{dipole}, and \
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* \pluginref{hk}
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@ -27,27 +27,66 @@ struct MaterialEntry {
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const char *name;
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Float sigmaS[3];
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Float sigmaA[3];
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Float g[3];
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Float eta;
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};
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/* Fitted data from "A Practical Model for Subsurface scattering" (Jensen et al.) */
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static MaterialEntry materialData[] = {
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{ "apple", { 2.29f, 2.39f, 1.97f }, { 0.0030f, 0.0034f, 0.046f }, 1.3f },
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{ "chicken1", { 0.15f, 0.21f, 0.38f }, { 0.0015f, 0.077f, 0.19f }, 1.3f },
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{ "chicken2", { 0.19f, 0.25f, 0.32f }, { 0.0018f, 0.088f, 0.20f }, 1.3f },
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{ "cream", { 7.38f, 5.47f, 3.15f }, { 0.0002f, 0.0028f, 0.0163f }, 1.3f },
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{ "ketchup", { 0.18f, 0.07f, 0.03f }, { 0.061f, 0.97f, 1.45f }, 1.3f },
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{ "marble", { 2.19f, 2.62f, 3.00f }, { 0.0021f, 0.0041f, 0.0071f }, 1.5f },
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{ "potato", { 0.68f, 0.70f, 0.55f }, { 0.0024f, 0.0090f, 0.12f }, 1.3f },
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{ "skimmilk", { 0.70f, 1.22f, 1.90f }, { 0.0014f, 0.0025f, 0.0142f }, 1.3f },
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{ "skin1", { 0.74f, 0.88f, 1.01f }, { 0.032f, 0.17f, 0.48f }, 1.3f },
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{ "skin2", { 1.09f, 1.59f, 1.79f }, { 0.013f, 0.070f, 0.145f }, 1.3f },
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{ "spectralon", { 11.6f, 20.4f, 14.9f }, { 0.00f, 0.00f, 0.00f }, 1.3f },
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{ "wholemilk", { 2.55f, 3.21f, 3.77f }, { 0.0011f, 0.0024f, 0.014f }, 1.3f },
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{ NULL, { 0.00f, 0.00f, 0.00f }, { 0.00f, 0.00f, 0.00f }, 0.0f }
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/* Fitted data from "A Practical Model for Subsurface scattering" (Jensen et al.). No anisotropy data available. */
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{ "Apple", { 2.29f, 2.39f, 1.97f }, { 0.0030f, 0.0034f, 0.046f }, { 1.0f, 1.0f, 1.0f }, 1.3f },
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{ "Chicken1", { 0.15f, 0.21f, 0.38f }, { 0.0015f, 0.077f, 0.19f }, { 1.0f, 1.0f, 1.0f }, 1.3f },
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{ "Chicken2", { 0.19f, 0.25f, 0.32f }, { 0.0018f, 0.088f, 0.20f }, { 1.0f, 1.0f, 1.0f }, 1.3f },
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{ "Cream", { 7.38f, 5.47f, 3.15f }, { 0.0002f, 0.0028f, 0.0163f }, { 1.0f, 1.0f, 1.0f }, 1.3f },
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{ "Ketchup", { 0.18f, 0.07f, 0.03f }, { 0.061f, 0.97f, 1.45f }, { 1.0f, 1.0f, 1.0f }, 1.3f },
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{ "Marble", { 2.19f, 2.62f, 3.00f }, { 0.0021f, 0.0041f, 0.0071f }, { 1.0f, 1.0f, 1.0f }, 1.5f },
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{ "Potato", { 0.68f, 0.70f, 0.55f }, { 0.0024f, 0.0090f, 0.12f }, { 1.0f, 1.0f, 1.0f }, 1.3f },
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{ "Skimmilk", { 0.70f, 1.22f, 1.90f }, { 0.0014f, 0.0025f, 0.0142f }, { 1.0f, 1.0f, 1.0f }, 1.3f },
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{ "Skin1", { 0.74f, 0.88f, 1.01f }, { 0.032f, 0.17f, 0.48f }, { 1.0f, 1.0f, 1.0f }, 1.3f },
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{ "Skin2", { 1.09f, 1.59f, 1.79f }, { 0.013f, 0.070f, 0.145f }, { 1.0f, 1.0f, 1.0f }, 1.3f },
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{ "Spectralon", { 11.6f, 20.4f, 14.9f }, { 0.00f, 0.00f, 0.00f }, { 1.0f, 1.0f, 1.0f }, 1.3f },
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{ "Wholemilk", { 2.55f, 3.21f, 3.77f }, { 0.0011f, 0.0024f, 0.014f }, { 1.0f, 1.0f, 1.0f }, 1.3f },
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/* From "Acquiring Scattering Properties of Participating Media by Dilution"
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by Narasimhan, Gupta, Donner, Ramamoorthi, Nayar, Jensen (SIGGRAPH 2006) */
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{ "Lowfat Milk", { 0.9124, 1.0744, 1.2492 }, { 0.0002, 0.0004, 0.0008 }, { 0.9320, 0.9020, 0.8590 }, 1.33f },
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{ "Reduced Milk", { 1.0748, 1.2209, 1.3931 }, { 0.0002, 0.0004, 0.0010 }, { 0.8190, 0.7970, 0.7460 }, 1.33f },
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{ "Regular Milk", { 1.1873, 1.3293, 1.4589 }, { 0.0001, 0.0003, 0.0013 }, { 0.7500, 0.7140, 0.6810 }, 1.33f },
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{ "Espresso", { 0.2707, 0.2828, 0.2970 }, { 0.1669, 0.2287, 0.3078 }, { 0.9070, 0.8960, 0.8800 }, 1.33f },
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{ "Mint Mocha Coffee", { 0.0916, 0.1081, 0.1460 }, { 0.0984, 0.1519, 0.2040 }, { 0.9100, 0.9070, 0.9140 }, 1.33f },
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{ "Lowfat Soy Milk", { 0.1418, 0.1620, 0.2715 }, { 0.0001, 0.0005, 0.0025 }, { 0.8500, 0.8530, 0.8420 }, 1.33f },
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{ "Regular Soy Milk", { 0.2433, 0.2714, 0.4563 }, { 0.0001, 0.0005, 0.0034 }, { 0.8730, 0.8580, 0.8320 }, 1.33f },
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{ "Lowfat Chocolate Milk", { 0.4277, 0.4998, 0.5723 }, { 0.0005, 0.0016, 0.0068 }, { 0.9340, 0.9270, 0.9160 }, 1.33f },
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{ "Regular Chocolate Milk", { 0.7352, 0.9142, 1.0588 }, { 0.0007, 0.0030, 0.0100 }, { 0.8620, 0.8380, 0.8060 }, 1.33f },
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{ "Coke", { 0.0177, 0.0208, 0.0000 }, { 0.6966, 1.1480, 1.7169 }, { 0.9650, 0.9720, 0.9685 }, 1.33f },
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{ "Pepsi", { 0.0058, 0.0141, 0.0000 }, { 0.6375, 0.9849, 1.4420 }, { 0.9260, 0.9790, 0.9525 }, 1.33f },
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{ "Sprite", { 0.0069, 0.0089, 0.0089 }, { 0.1230, 0.1194, 0.1306 }, { 0.9430, 0.9530, 0.9520 }, 1.33f },
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{ "Gatorade", { 0.2392, 0.2927, 0.3745 }, { 0.1617, 0.1258, 0.0579 }, { 0.9330, 0.9330, 0.9350 }, 1.33f },
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{ "Chardonnay", { 0.0030, 0.0047, 0.0069 }, { 0.1547, 0.1701, 0.3443 }, { 0.9140, 0.9580, 0.9750 }, 1.33f },
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{ "White Zinfandel", { 0.0031, 0.0048, 0.0066 }, { 0.1732, 0.2322, 0.2847 }, { 0.9190, 0.9430, 0.9720 }, 1.33f },
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{ "Merlot", { 0.0053, 0.0000, 0.0000 }, { 0.7586, 1.6429, 1.9196 }, { 0.9740, 0.9740, 0.9740 }, 1.33f },
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{ "Budweiser Beer", { 0.0037, 0.0069, 0.0074 }, { 0.1449, 0.3141, 0.7286 }, { 0.9170, 0.9560, 0.9820 }, 1.33f },
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{ "Coors Light Beer", { 0.0027, 0.0055, 0.0000 }, { 0.0268, 0.0608, 0.1521 }, { 0.9180, 0.9660, 0.9420 }, 1.33f },
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{ "Clorox", { 0.1425, 0.1723, 0.1928 }, { 0.0175, 0.0777, 0.1372 }, { 0.9120, 0.9050, 0.8920 }, 1.33f },
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{ "Apple Juice", { 0.0201, 0.0243, 0.0323 }, { 0.1014, 0.1858, 0.4084 }, { 0.9470, 0.9490, 0.9450 }, 1.33f },
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{ "Cranberry Juice", { 0.0128, 0.0155, 0.0196 }, { 0.2572, 0.6145, 0.8104 }, { 0.9470, 0.9510, 0.9740 }, 1.33f },
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{ "Grape Juice", { 0.0072, 0.0000, 0.0000 }, { 0.5428, 1.2500, 1.5300 }, { 0.9610, 0.9610, 0.9610 }, 1.33f },
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{ "Ruby Grapefruit Juice", { 0.1617, 0.1606, 0.1669 }, { 0.0896, 0.1911, 0.2636 }, { 0.9290, 0.9290, 0.9310 }, 1.33f },
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{ "White Grapefruit Juice", { 0.3513, 0.3669, 0.5237 }, { 0.0096, 0.0131, 0.0395 }, { 0.5480, 0.5450, 0.5650 }, 1.33f },
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{ "Shampoo", { 0.0104, 0.0114, 0.0147 }, { 0.0184, 0.0596, 0.0805 }, { 0.9100, 0.9050, 0.9200 }, 1.33f },
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{ "Strawberry Shampoo", { 0.0028, 0.0032, 0.0033 }, { 0.0189, 0.0756, 0.0989 }, { 0.9270, 0.9350, 0.9940 }, 1.33f },
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{ "Head & Shoulders Shampoo", { 0.2791, 0.2890, 0.3086 }, { 0.0883, 0.1637, 0.2125 }, { 0.9110, 0.8960, 0.8840 }, 1.33f },
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{ "Lemon Tea Powder", { 0.0798, 0.0898, 0.1073 }, { 0.2602, 0.4902, 0.7727 }, { 0.9460, 0.9460, 0.9490 }, 1.33f },
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{ "Orange Juice Powder", { 0.1928, 0.2132, 0.2259 }, { 0.1449, 0.3441, 0.7863 }, { 0.9190, 0.9180, 0.9220 }, 1.33f },
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{ "Pink Lemonade Powder", { 0.1235, 0.1334, 0.1305 }, { 0.1165, 0.2366, 0.3195 }, { 0.9020, 0.9020, 0.9040 }, 1.33f },
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{ "Cappuccino Powder", { 0.0654, 0.0882, 0.1568 }, { 0.1920, 0.2654, 0.3272 }, { 0.8490, 0.8430, 0.9260 }, 1.33f },
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{ "Salt Powder", { 0.2485, 0.2822, 0.3216 }, { 0.5115, 0.5863, 0.6147 }, { 0.8020, 0.7930, 0.8210 }, 1.33f },
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{ "Sugar Powder", { 0.0145, 0.0162, 0.0202 }, { 0.0650, 0.1597, 0.2578 }, { 0.9210, 0.9190, 0.9310 }, 1.33f },
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{ "Suisse Mocha", { 0.3223, 0.3583, 0.4148 }, { 0.1875, 0.2893, 0.3796 }, { 0.9070, 0.8940, 0.8880 }, 1.33f },
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{ NULL, { 0.0f, 0.0f, 0.0f }, { 0.0f, 0.0f, 0.0f }, { 0.0f, 0.0f, 0.0f }, 0.0f }
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};
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static void lookupMaterial(const Properties &props, Spectrum &sigmaS, Spectrum &sigmaA, Float *eta = NULL) {
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static void lookupMaterial(const Properties &props, Spectrum &sigmaS, Spectrum &sigmaA, Spectrum &g, Float *eta = NULL) {
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bool hasSigmaAS = props.hasProperty("sigmaS") || props.hasProperty("sigmaA"),
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hasSigmaTAlbedo = props.hasProperty("sigmaT") || props.hasProperty("albedo"),
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hasIOR = props.hasProperty("intIOR") || props.hasProperty("extIOR"),
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@ -66,13 +105,13 @@ static void lookupMaterial(const Properties &props, Spectrum &sigmaS, Spectrum &
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"sigmaT & albedo, but no other combinations!");
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std::string material =
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boost::to_lower_copy(props.getString("material", "skin1"));
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boost::to_lower_copy(props.getString("material", "Skin1"));
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/* Start with a preset */
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bool found = false;
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MaterialEntry *matEntry = materialData;
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while (matEntry->name) {
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if (material == matEntry->name) {
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if (material == boost::to_lower_copy(std::string(matEntry->name))) {
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sigmaS.fromLinearRGB(
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matEntry->sigmaS[0],
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matEntry->sigmaS[1],
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@ -81,6 +120,10 @@ static void lookupMaterial(const Properties &props, Spectrum &sigmaS, Spectrum &
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matEntry->sigmaA[0],
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matEntry->sigmaA[1],
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matEntry->sigmaA[2]);
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g.fromLinearRGB(
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matEntry->g[0],
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matEntry->g[1],
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matEntry->g[2]);
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sigmaS *= 100;
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sigmaA *= 100;
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if (eta)
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@ -118,6 +161,12 @@ static void lookupMaterial(const Properties &props, Spectrum &sigmaS, Spectrum &
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sigmaA = sigmaT - sigmaS;
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}
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if (props.hasProperty("g"))
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g = Spectrum(props.getFloat("g"));
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if (g.min() <= -1 || g.max() >= 1)
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SLog(EError, "The anisotropy parameter 'g' must be in the range (-1, 1)!");
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if (eta && hasIOR) {
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/* Specifies the internal index of refraction at the interface */
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Float intIOR = lookupIOR(props, "intIOR", "bk7");
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@ -137,7 +186,7 @@ static void lookupMaterial(const Properties &props, Spectrum &sigmaS, Spectrum &
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sigmaA *= scale;
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std::ostringstream oss;
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oss << "Medium parameters: sigmaS=" << sigmaS.toString() << ", sigmaA=" << sigmaA.toString();
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oss << "Medium parameters: sigmaS=" << sigmaS.toString() << ", sigmaA=" << sigmaA.toString() << ", g=" << g.average();
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SLog(EDebug, "%s", oss.str().c_str());
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}
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@ -289,18 +289,17 @@ public:
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m_quality = props.getFloat("quality", 0.2f);
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/* Asymmetry parameter of the phase function */
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m_g = props.getFloat("g", 0);
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m_ready = false;
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m_octreeResID = -1;
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lookupMaterial(props, m_sigmaS, m_sigmaA, &m_eta);
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lookupMaterial(props, m_sigmaS, m_sigmaA, m_g, &m_eta);
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}
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IsotropicDipole(Stream *stream, InstanceManager *manager)
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: Subsurface(stream, manager) {
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m_sigmaS = Spectrum(stream);
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m_sigmaA = Spectrum(stream);
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m_g = stream->readFloat();
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m_g = Spectrum(stream);
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m_eta = stream->readFloat();
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m_sampleMultiplier = stream->readFloat();
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m_quality = stream->readFloat();
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@ -326,7 +325,7 @@ public:
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Subsurface::serialize(stream, manager);
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m_sigmaS.serialize(stream);
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m_sigmaA.serialize(stream);
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stream->writeFloat(m_g);
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m_g.serialize(stream);
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stream->writeFloat(m_eta);
|
||||
stream->writeFloat(m_sampleMultiplier);
|
||||
stream->writeFloat(m_quality);
|
||||
|
|
@ -351,7 +350,7 @@ public:
|
|||
}
|
||||
|
||||
void configure() {
|
||||
m_sigmaSPrime = m_sigmaS * (1 - m_g);
|
||||
m_sigmaSPrime = m_sigmaS * (Spectrum(1.0f) - m_g);
|
||||
m_sigmaTPrime = m_sigmaSPrime + m_sigmaA;
|
||||
|
||||
/* Find the smallest mean-free path over all wavelengths */
|
||||
|
|
@ -466,8 +465,8 @@ public:
|
|||
MTS_DECLARE_CLASS()
|
||||
private:
|
||||
Float m_radius, m_sampleMultiplier;
|
||||
Float m_Fdr, m_quality, m_g, m_eta;
|
||||
Spectrum m_sigmaS, m_sigmaA;
|
||||
Float m_Fdr, m_quality, m_eta;
|
||||
Spectrum m_sigmaS, m_sigmaA, m_g;
|
||||
Spectrum m_sigmaTr, m_zr, m_zv;
|
||||
Spectrum m_sigmaSPrime, m_sigmaTPrime;
|
||||
ref<IrradianceOctree> m_octree;
|
||||
|
|
|
|||
Loading…
Reference in New Issue