2 * Adapted from Open Shading Language with this license:
4 * Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
7 * Modifications Copyright 2011, Blender Foundation.
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10 * modification, are permitted provided that the following conditions are
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33 #ifndef __BSDF_REFLECTION_H__
34 #define __BSDF_REFLECTION_H__
40 ccl_device int bsdf_reflection_setup(MicrofacetBsdf *bsdf)
42 bsdf->type = CLOSURE_BSDF_REFLECTION_ID;
46 ccl_device float3 bsdf_reflection_eval_reflect(const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf)
48 return make_float3(0.0f, 0.0f, 0.0f);
51 ccl_device float3 bsdf_reflection_eval_transmit(const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf)
53 return make_float3(0.0f, 0.0f, 0.0f);
56 ccl_device int bsdf_reflection_sample(const ShaderClosure *sc, float3 Ng, float3 I, float3 dIdx, float3 dIdy, float randu, float randv, float3 *eval, float3 *omega_in, float3 *domega_in_dx, float3 *domega_in_dy, float *pdf)
58 const MicrofacetBsdf *bsdf = (const MicrofacetBsdf*)sc;
61 // only one direction is possible
62 float cosNO = dot(N, I);
64 *omega_in = (2 * cosNO) * N - I;
65 if(dot(Ng, *omega_in) > 0) {
66 #ifdef __RAY_DIFFERENTIALS__
67 *domega_in_dx = 2 * dot(N, dIdx) * N - dIdx;
68 *domega_in_dy = 2 * dot(N, dIdy) * N - dIdy;
70 /* Some high number for MIS. */
72 *eval = make_float3(1e6f, 1e6f, 1e6f);
75 return LABEL_REFLECT|LABEL_SINGULAR;
80 #endif /* __BSDF_REFLECTION_H__ */