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
33 lines
901 B
C
33 lines
901 B
C
/* SPDX-License-Identifier: Apache-2.0
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* Copyright 2011-2022 Blender Foundation */
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#pragma once
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#include "kernel/types.h"
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CCL_NAMESPACE_BEGIN
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struct GuidingParams {
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/* The subset of path guiding parameters that can trigger a creation/rebuild
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* of the guiding field. */
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bool use = false;
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bool use_surface_guiding = false;
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bool use_volume_guiding = false;
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GuidingDistributionType type = GUIDING_TYPE_PARALLAX_AWARE_VMM;
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int training_samples = 128;
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bool deterministic = false;
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GuidingParams() = default;
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bool modified(const GuidingParams &other) const
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{
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return !((use == other.use) && (use_surface_guiding == other.use_surface_guiding) &&
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(use_volume_guiding == other.use_volume_guiding) && (type == other.type) &&
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(training_samples == other.training_samples) &&
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(deterministic == other.deterministic));
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}
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};
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CCL_NAMESPACE_END
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