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wireframe improvements

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Wenzel Jakob 2011-11-11 12:09:11 -05:00
parent 7328637c54
commit 3e0e3cd757
1 changed files with 23 additions and 17 deletions
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40
src/textures/wireframe.cpp
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@ -37,6 +37,12 @@ MTS_NAMESPACE_BEGIN
* World-space width of the mesh edges * World-space width of the mesh edges
* \default{automatic} * \default{automatic}
* } * }
* \parameter{stepWidth}{\Float}{
* Controls the width of of step function used for the
* color transition. It is specified as a value between zero
* and one (relative to the \code{lineWidth} parameter)
* \default{0.5}
* }
* } * }
* *
* This plugin implements a simple two-color wireframe texture map * This plugin implements a simple two-color wireframe texture map
@ -44,11 +50,13 @@ MTS_NAMESPACE_BEGIN
*/ */
class WireFrame : public Texture { class WireFrame : public Texture {
public: public:
WireFrame(const Properties &props) : Texture(props) { WireFrame(const Properties &props) : Texture(props),
m_edgeColor = props.getSpectrum("edgeColor", Spectrum(0.1f)); m_lineWidth(props.getFloat("lineWidth", 0.0f)),
m_interiorColor = props.getSpectrum("interiorColor", Spectrum(.5f)); m_mutex(new Mutex()),
m_lineWidth = props.getFloat("lineWidth", 0.0f); m_stepWidth(props.getFloat("stepWidth", 0.5f)),
m_mutex = new Mutex(); m_edgeColor(props.getSpectrum("edgeColor", Spectrum(0.1f))),
m_interiorColor(props.getSpectrum("interiorColor", Spectrum(.5f))) {
m_stepWidth = std::max(0.0f, std::min(m_stepWidth, 1.f));
} }
WireFrame(Stream *stream, InstanceManager *manager) WireFrame(Stream *stream, InstanceManager *manager)
@ -87,7 +95,7 @@ public:
const Triangle &tri = triMesh->getTriangles()[i]; const Triangle &tri = triMesh->getTriangles()[i];
for (int j=0; j<3; ++j) for (int j=0; j<3; ++j)
m_lineWidth += (positions[tri.idx[j]] m_lineWidth += (positions[tri.idx[j]]
- positions[tri.idx[j+1%3]]).length(); - positions[tri.idx[(j+1)%3]]).length();
} }
m_lineWidth = 0.1f * m_lineWidth / (3 * triMesh->getTriangleCount()); m_lineWidth = 0.1f * m_lineWidth / (3 * triMesh->getTriangleCount());
@ -97,23 +105,19 @@ public:
const Triangle &tri = triMesh->getTriangles()[its.primIndex]; const Triangle &tri = triMesh->getTriangles()[its.primIndex];
Point pos[] = { positions[tri.idx[0]],
positions[tri.idx[1]],
positions[tri.idx[2]] };
Float minDist = std::numeric_limits<Float>::infinity(); Float minDist = std::numeric_limits<Float>::infinity();
for (int i=0; i<3; ++i) { for (int i=0; i<3; ++i) {
Point cur = pos[i], next = pos[(i+1)%3]; const Point& cur = positions[tri.idx[i]];
const Point& next = positions[tri.idx[(i+1)%3]];
Vector d1 = normalize(next - cur), Vector d1 = normalize(next - cur),
d2 = its.p - cur; d2 = its.p - cur;
minDist = std::min(minDist, (cur + d1 * dot(d1, d2) - its.p).lengthSquared()); minDist = std::min(minDist, (cur + d1 * dot(d1, d2) - its.p).lengthSquared());
} }
Float value = 1-smoothStep(0, m_lineWidth, std::sqrt(minDist)); Float a = smoothStep(m_lineWidth*(1.f-m_stepWidth), m_lineWidth, std::sqrt(minDist));
return m_edgeColor*(1-a) + m_interiorColor*a;
return m_edgeColor * value + m_interiorColor * (1-value);
} }
bool usesRayDifferentials() const { bool usesRayDifferentials() const {
@ -150,8 +154,9 @@ public:
std::ostringstream oss; std::ostringstream oss;
oss << "WireFrame[" << endl oss << "WireFrame[" << endl
<< " edgeColor = " << m_edgeColor.toString() << "," << endl << " edgeColor = " << m_edgeColor.toString() << "," << endl
<< " interiorColor = " << m_interiorColor.toString() << "," << endl << " interiorColor = " << m_interiorColor.toString() << "," << endl
<< " lineWidth = " << m_lineWidth << endl << " lineWidth = " << m_lineWidth << endl
<< " stepWidth = " << m_stepWidth << endl
<< "]"; << "]";
return oss.str(); return oss.str();
} }
@ -162,6 +167,7 @@ public:
protected: protected:
mutable Float m_lineWidth; mutable Float m_lineWidth;
mutable ref<Mutex> m_mutex; mutable ref<Mutex> m_mutex;
Float m_stepWidth;
Spectrum m_edgeColor; Spectrum m_edgeColor;
Spectrum m_interiorColor; Spectrum m_interiorColor;
}; };
@ -203,5 +209,5 @@ Shader *WireFrame::createShader(Renderer *renderer) const {
MTS_IMPLEMENT_CLASS(WireFrameShader, false, Shader) MTS_IMPLEMENT_CLASS(WireFrameShader, false, Shader)
MTS_IMPLEMENT_CLASS_S(WireFrame, false, Texture) MTS_IMPLEMENT_CLASS_S(WireFrame, false, Texture)
MTS_EXPORT_PLUGIN(WireFrame, "Vertex color texture"); MTS_EXPORT_PLUGIN(WireFrame, "Wireframe texture");
MTS_NAMESPACE_END MTS_NAMESPACE_END