bd8a44e169
Add new "Soft Falloff" option on point and spot light that uses the old light behavior from Blender versions before 4.0. Blend files saved with those older versions will use the option. This option is enabled by default on new lights. Fix #114241 Co-authored-by: Weizhen Huang <weizhen@blender.org> Co-authored-by: Clément Foucault <foucault.clem@gmail.com> Pull Request: https://projects.blender.org/blender/blender/pulls/117832
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
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*
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* SPDX-License-Identifier: Apache-2.0 */
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#pragma once
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#include "kernel/sample/mapping.h"
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CCL_NAMESPACE_BEGIN
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/* Light Sample Result */
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typedef struct LightSample {
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float3 P; /* position on light, or direction for distant light */
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float3 Ng; /* normal on light */
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float3 D; /* direction from shading point to light */
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float t; /* distance to light (FLT_MAX for distant light) */
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float u, v; /* parametric coordinate on primitive */
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float pdf; /* pdf for selecting light and point on light */
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float pdf_selection; /* pdf for selecting light */
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float eval_fac; /* intensity multiplier */
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int object; /* object id for triangle/curve lights */
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int prim; /* primitive id for triangle/curve lights */
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int shader; /* shader id */
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int lamp; /* lamp id */
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int group; /* lightgroup */
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LightType type; /* type of light */
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} LightSample;
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/* Utilities */
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ccl_device_inline float3 ellipse_sample(float3 ru, float3 rv, float2 rand)
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{
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const float2 uv = sample_uniform_disk(rand);
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return ru * uv.x + rv * uv.y;
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}
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ccl_device_inline float3 rectangle_sample(float3 ru, float3 rv, float2 rand)
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{
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return ru * (2.0f * rand.x - 1.0f) + rv * (2.0f * rand.y - 1.0f);
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}
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ccl_device float3 disk_light_sample(float3 n, float2 rand)
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{
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float3 ru, rv;
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make_orthonormals(n, &ru, &rv);
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return ellipse_sample(ru, rv, rand);
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}
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ccl_device float light_pdf_area_to_solid_angle(const float3 Ng, const float3 I, float t)
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{
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float cos_pi = dot(Ng, I);
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if (cos_pi <= 0.0f)
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return 0.0f;
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return t * t / cos_pi;
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}
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/* Visibility flag om the light shader. */
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ccl_device_inline bool is_light_shader_visible_to_path(const int shader, const uint32_t path_flag)
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{
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if ((shader & SHADER_EXCLUDE_ANY) == 0) {
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return true;
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}
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if (((shader & SHADER_EXCLUDE_DIFFUSE) && (path_flag & PATH_RAY_DIFFUSE)) ||
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((shader & SHADER_EXCLUDE_GLOSSY) && ((path_flag & (PATH_RAY_GLOSSY | PATH_RAY_REFLECT)) ==
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(PATH_RAY_GLOSSY | PATH_RAY_REFLECT))) ||
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((shader & SHADER_EXCLUDE_TRANSMIT) && (path_flag & PATH_RAY_TRANSMIT)) ||
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((shader & SHADER_EXCLUDE_CAMERA) && (path_flag & PATH_RAY_CAMERA)) ||
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((shader & SHADER_EXCLUDE_SCATTER) && (path_flag & PATH_RAY_VOLUME_SCATTER)))
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{
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return false;
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}
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return true;
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}
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CCL_NAMESPACE_END
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