e949d6da5b
* Store compact ray differentials in ShaderData and compute full differentials on demand. This reduces register pressure on the GPU. * Remove BSDF differential code that was effectively doing nothing as the differential orientation was discarded when making it compact. This gives a 1-5% speedup with RTX A6000 + OptiX in our benchmarks, with the bigger speedups in simpler scenes. Renders appear to be identical except for the Both displacement option that does both displacement and bump. Differential Revision: https://developer.blender.org/D15677
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
|
|
*
|
|
* Adapted from Open Shading Language
|
|
* Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
|
|
* All Rights Reserved.
|
|
*
|
|
* Modifications Copyright 2011-2022 Blender Foundation. */
|
|
|
|
#pragma once
|
|
|
|
CCL_NAMESPACE_BEGIN
|
|
|
|
/* REFRACTION */
|
|
|
|
ccl_device int bsdf_refraction_setup(ccl_private MicrofacetBsdf *bsdf)
|
|
{
|
|
bsdf->type = CLOSURE_BSDF_REFRACTION_ID;
|
|
return SD_BSDF;
|
|
}
|
|
|
|
ccl_device Spectrum bsdf_refraction_eval_reflect(ccl_private const ShaderClosure *sc,
|
|
const float3 I,
|
|
const float3 omega_in,
|
|
ccl_private float *pdf)
|
|
{
|
|
*pdf = 0.0f;
|
|
return zero_spectrum();
|
|
}
|
|
|
|
ccl_device Spectrum bsdf_refraction_eval_transmit(ccl_private const ShaderClosure *sc,
|
|
const float3 I,
|
|
const float3 omega_in,
|
|
ccl_private float *pdf)
|
|
{
|
|
*pdf = 0.0f;
|
|
return zero_spectrum();
|
|
}
|
|
|
|
ccl_device int bsdf_refraction_sample(ccl_private const ShaderClosure *sc,
|
|
float3 Ng,
|
|
float3 I,
|
|
float randu,
|
|
float randv,
|
|
ccl_private Spectrum *eval,
|
|
ccl_private float3 *omega_in,
|
|
ccl_private float *pdf)
|
|
{
|
|
ccl_private const MicrofacetBsdf *bsdf = (ccl_private const MicrofacetBsdf *)sc;
|
|
float m_eta = bsdf->ior;
|
|
float3 N = bsdf->N;
|
|
|
|
float3 R, T;
|
|
bool inside;
|
|
float fresnel;
|
|
fresnel = fresnel_dielectric(m_eta, N, I, &R, &T, &inside);
|
|
|
|
if (!inside && fresnel != 1.0f) {
|
|
/* Some high number for MIS. */
|
|
*pdf = 1e6f;
|
|
*eval = make_spectrum(1e6f);
|
|
*omega_in = T;
|
|
}
|
|
else {
|
|
*pdf = 0.0f;
|
|
*eval = zero_spectrum();
|
|
}
|
|
return LABEL_TRANSMIT | LABEL_SINGULAR;
|
|
}
|
|
|
|
CCL_NAMESPACE_END
|