75a6d3abf7
This adds path guiding features into Cycles by integrating Intel's Open Path Guiding Library. It can be enabled in the Sampling > Path Guiding panel in the render properties. This feature helps reduce noise in scenes where finding a path to light is difficult for regular path tracing. The current implementation supports guiding directional sampling decisions on surfaces, when the material contains a least one diffuse component, and in volumes with isotropic and anisotropic Henyey-Greenstein phase functions. On surfaces, the guided sampling decision is proportional to the product of the incident radiance and the normal-oriented cosine lobe and in volumes it is proportional to the product of the incident radiance and the phase function. The incident radiance field of a scene is learned and updated during rendering after each per-frame rendering iteration/progression. At the moment, path guiding is only supported by the CPU backend. Support for GPU backends will be added in future versions of OpenPGL. Ref T92571 Differential Revision: https://developer.blender.org/D15286
42 lines
647 B
C
42 lines
647 B
C
/* SPDX-License-Identifier: Apache-2.0
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* Copyright 2022 Blender Foundation */
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#pragma once
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#ifdef WITH_PATH_GUIDING
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# include <openpgl/cpp/OpenPGL.h>
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# include <openpgl/version.h>
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#endif
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#include "util/system.h"
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CCL_NAMESPACE_BEGIN
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static int guiding_device_type()
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{
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#ifdef WITH_PATH_GUIDING
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# if defined(__ARM_NEON)
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return 8;
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# else
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# if OPENPGL_VERSION_MINOR >= 4
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if (system_cpu_support_avx2()) {
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return 8;
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}
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# endif
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if (system_cpu_support_sse41()) {
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return 4;
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}
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return 0;
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# endif
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#else
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return 0;
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#endif
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}
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static inline bool guiding_supported()
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{
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return guiding_device_type() != 0;
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}
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CCL_NAMESPACE_END
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