<!-- This file defines a series of BSDF instances to be tested for consistency. This is done using the testcase 'test_chisquare' --> <scene version="0.4.0"> <!-- Test the smooth plastic model with preserveColors=false --> <bsdf type="plastic"> <boolean name="preserveColors" value="false"/> </bsdf> <!-- Test the smooth plastic model with preserveColors=true --> <bsdf type="plastic"> <boolean name="preserveColors" value="true"/> </bsdf> <!-- Test the smooth diffuse model --> <bsdf type="diffuse"/> <!-- Test the rough diffuse model --> <bsdf type="roughdiffuse"/> <!-- Test the two-sided model --> <bsdf type="twosided"> <bsdf type="diffuse"/> </bsdf> <!-- Test the diffuse transmission model --> <bsdf type="difftrans"/> <!-- Test a simple mixturebsdf between diffuse transmittance and reflectance --> <bsdf type="mixturebsdf"> <string name="weights" value=".5 .3"/> <bsdf type="diffuse"> <rgb name="reflectance" value=".5 0 0"/> </bsdf> <bsdf type="difftrans"> <rgb name="transmittance" value="0 .5 0"/> </bsdf> </bsdf> <!-- Test the smooth conductor model --> <bsdf type="conductor"/> <!-- Test the smooth dielectric model --> <bsdf type="dielectric"> <string name="intIOR" value="water"/> <string name="extIOR" value="air"/> </bsdf> <!-- Test a mixturebsdf of degenerate materials --> <bsdf type="mixturebsdf"> <string name="weights" value=".8 .2"/> <bsdf type="dielectric"/> <bsdf type="conductor"/> </bsdf> <!-- Test a mixturebsdf of degenerate and non-degenerate materials --> <bsdf type="mixturebsdf"> <string name="weights" value=".8 .2"/> <bsdf type="dielectric"/> <bsdf type="diffuse"/> </bsdf> <!-- Test the Hanrahan-Krueger model with an isotropic phase function --> <bsdf type="hk"/> <!-- Test the Hanrahan-Krueger model with a forward-scattering phase function --> <bsdf type="hk"> <phase type="hg"> <float name="g" value="0.8"/> </phase> </bsdf> <!-- Test the rough glass model with the Beckmann microfacet distribution --> <bsdf type="roughdielectric"> <string name="distribution" value="beckmann"/> <float name="alpha" value=".3"/> <float name="intIOR" value="1.5"/> <float name="extIOR" value="1.0"/> </bsdf> <!-- Test the rough glass model with the Phong microfacet distribution --> <bsdf type="roughdielectric"> <string name="distribution" value="phong"/> <float name="alpha" value=".3"/> <float name="intIOR" value="1.5"/> <float name="extIOR" value="1.0"/> </bsdf> <!-- Test the rough glass model with the GGX microfacet distribution --> <bsdf type="roughdielectric"> <string name="distribution" value="ggx"/> <float name="alpha" value=".3"/> <float name="intIOR" value="1.5"/> <float name="extIOR" value="1.0"/> </bsdf> <!-- Test the rough dielectric model with the anisotropic Ashikhmin-Shirley microfacet distribution --> <bsdf type="roughdielectric"> <string name="distribution" value="as"/> <float name="alphaU" value=".1"/> <float name="alphaV" value=".3"/> <float name="intIOR" value="1.5"/> <float name="extIOR" value="1.0"/> </bsdf> <!-- Test the rough conductor model with the Beckmann microfacet distribution --> <bsdf type="roughconductor"> <string name="distribution" value="beckmann"/> <float name="alpha" value=".3"/> </bsdf> <!-- Test the rough dielectric model with the anisotropic Ashikhmin-Shirley microfacet distribution --> <bsdf type="roughconductor"> <string name="material" value="Au"/> <string name="distribution" value="as"/> <float name="alphaU" value="0.1"/> <float name="alphaV" value="0.3"/> </bsdf> <!-- Test the rough plastic model with the Beckmann microfacet distribution --> <bsdf type="roughplastic"> <string name="distribution" value="beckmann"/> <float name="alpha" value=".7"/> </bsdf> <!-- Test the modified Phong BRDF --> <bsdf type="phong"> <spectrum name="diffuseReflectance" value="0.2"/> <spectrum name="specularReflectance" value="0.4"/> </bsdf> <!-- Test the anisotropic Ward model --> <bsdf type="ward"> <float name="alphaU" value=".1"/> <float name="alphaV" value=".3"/> <spectrum name="diffuseReflectance" value="0.2"/> <spectrum name="specularReflectance" value="0.4"/> </bsdf> <!-- Test the mask model (with constant 50% opacity) --> <bsdf type="mask"> <spectrum name="opacity" value="0.5"/> <bsdf type="diffuse"/> </bsdf> <!-- Test the smooth coating over a diffuse base material --> <bsdf type="coating"> <float name="intIOR" value="1.5"/> <float name="extIOR" value="1"/> <rgb name="sigmaA" value="0.1 0.2 0.3"/> <float name="thickness" value="2"/> <bsdf type="diffuse"/> </bsdf> <!-- Test the smooth coating over a rough metal material --> <bsdf type="coating"> <float name="intIOR" value="1.5"/> <float name="extIOR" value="1"/> <bsdf type="roughconductor"/> </bsdf> <!-- Test the coating model with a transmissive + reflective material --> <bsdf type="coating"> <rgb name="sigmaA" value="0.1 0.2 0.3"/> <float name="thickness" value="2"/> <bsdf type="mixturebsdf"> <string name="weights" value=".5 .3"/> <bsdf type="diffuse"> <rgb name="reflectance" value=".5 0 0"/> </bsdf> <bsdf type="difftrans"> <rgb name="transmittance" value="0 .5 0"/> </bsdf> </bsdf> </bsdf> <!-- Test the coating model with a material that has a delta transmission component --> <bsdf type="coating"> <bsdf type="mask"> <bsdf type="diffuse"/> <spectrum name="opacity" value="0.5"/> </bsdf> </bsdf> <!-- Test the coating model with the Hanrahan-Krueger model --> <bsdf type="coating"> <bsdf type="hk"> <rgb name="sigmaA" value="0.1 0.2 0.3"/> <rgb name="sigmaS" value="1"/> <float name="thickness" value="2"/> </bsdf> </bsdf> <!-- Test the rough coating model --> <bsdf type="roughcoating"> <bsdf type="roughconductor"> <string name="distribution" value="beckmann"/> <float name="alpha" value=".3"/> </bsdf> </bsdf> </scene>