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test/intern/cycles/util
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Lukas Stockner fbc770d58b Cycles: Fallback to area PDF when spherical rectangles are too small 
This fixes #69535 and #98930.

We use a equi-solid-angle sampling algorithm for rectangular area lights,
but it is not particularly robust for small area lights (either small
in general and/or small because it's being viewed from grazing angles).

The actual sampling part is fine since it just gets clamped into the
valid area anyways, and the difference isn't notable for small lights.

However, we also need to compute the solid angle to get the sampling PDF,
and that computation is quite sensitive to numerical issues for small
values.

Therefore, this commit adds a fallback path for small values, which instead
uses the classic equi-area sampling PDF term times the area-to-solid-angle
Jacobian term. This approximation assumes that all points on the light have
the same distance and angle to the sampling point, which is of course not
strictly the case, but it's close enough for small area lights and better
than failing altogether.

Pull Request: https://projects.blender.org/blender/blender/pulls/122323
2024-06-04 01:55:26 +02:00
..
algorithm.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
aligned_malloc.cpp
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
aligned_malloc.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
args.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
array.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
atomic.h
Cycles: Enable floating point atomic support in Metal
2024-01-04 17:08:29 +01:00
boundbox.h
Cleanup: use braces in headers
2023-09-24 14:52:38 +10:00
CMakeLists.txt
Cycles: Increase minimum target on x86 to SSE4.2
2024-02-26 14:49:19 +01:00
color.h
Cleanup: spelling in comments
2024-04-01 16:47:57 +11:00
debug.cpp
Cycles: Increase minimum target on x86 to SSE4.2
2024-02-26 14:49:19 +01:00
debug.h
Cycles: Increase minimum target on x86 to SSE4.2
2024-02-26 14:49:19 +01:00
defines.h
Cycles: Add Windows ARM64 support
2024-03-06 16:14:34 +01:00
deque.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
disjoint_set.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
foreach.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
function.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
guarded_allocator.cpp
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
guarded_allocator.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
guiding.h
Cycles: Rename SSE4.1 kernel to SSE4.2
2024-02-09 17:25:58 +01:00
half.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
hash.h
Cycles: Cleanup: Remove unused hash function
2024-05-13 02:48:54 +02:00
ies.cpp
Cleanup: spelling in comments
2024-02-02 10:48:22 +11:00
ies.h
Cycles: Support Type-A IES files
2024-01-29 01:03:47 +01:00
image_impl.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
image.h
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2023-06-14 16:53:23 +10:00
list.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
log.cpp
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
log.h
Cleanup: fewer iostreams related includes in Cycles
2023-08-15 13:55:38 +02:00
map.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
math_cdf.cpp
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
math_cdf.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
math_fast.h
Cycles: Rename SSE4.1 kernel to SSE4.2
2024-02-09 17:25:58 +01:00
math_float2.h
Cycles: Add thin film iridescence to Principled BSDF
2024-05-02 14:28:44 +02:00
math_float3.h
Cycles: Add thin film iridescence to Principled BSDF
2024-05-02 14:28:44 +02:00
math_float4.h
Cycles: Fallback to area PDF when spherical rectangles are too small
2024-06-04 01:55:26 +02:00
math_float8.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
math_int2.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
math_int3.h
Cycles: Rename SSE4.1 kernel to SSE4.2
2024-02-09 17:25:58 +01:00
math_int4.h
Cycles: Rename SSE4.1 kernel to SSE4.2
2024-02-09 17:25:58 +01:00
math_int8.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
math_intersect.h
Cycles: improve equiangular sampling in volume
2024-03-25 13:02:02 +01:00
math_matrix.h
Cleanup: use braces in headers
2023-09-24 14:52:38 +10:00
math.h
Cycles: improve equiangular sampling in volume
2024-03-25 13:02:02 +01:00
md5.cpp
Cleanup: use braces for sources in intern/
2023-09-17 09:05:40 +10:00
md5.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
murmurhash.cpp
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
murmurhash.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
openimagedenoise.h
Cycles: Add Windows ARM64 support
2024-03-06 16:14:34 +01:00
openvdb.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
optimization.h
Cycles: Add Windows ARM64 support
2024-03-06 16:14:34 +01:00
param.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
path.cpp
Clang Format: bump to version 17
2024-01-03 13:38:14 +01:00
path.h
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2023-06-14 16:53:23 +10:00
profiling.cpp
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2023-06-14 16:53:23 +10:00
profiling.h
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2023-06-14 16:53:23 +10:00
progress.h
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2023-06-14 16:53:23 +10:00
projection.h
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2023-06-14 16:53:23 +10:00
queue.h
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2023-06-14 16:53:23 +10:00
rect.h
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2023-06-14 16:53:23 +10:00
semaphore.h
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2023-06-14 16:53:23 +10:00
set.h
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2023-06-14 16:53:23 +10:00
simd.h
Cycles: Add Windows ARM64 support
2024-03-06 16:14:34 +01:00
stack_allocator.h
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2023-06-14 16:53:23 +10:00
static_assert.h
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2023-06-14 16:53:23 +10:00
stats.h
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2023-06-14 16:53:23 +10:00
string.cpp
Cleanup: use braces for sources in intern/
2023-09-17 09:05:40 +10:00
string.h
Cleanup: fewer iostreams related includes in Cycles
2023-08-15 13:55:38 +02:00
system.cpp
Cycles: Add Windows ARM64 support
2024-03-06 16:14:34 +01:00
system.h
Cycles: Increase minimum target on x86 to SSE4.2
2024-02-26 14:49:19 +01:00
task.cpp
Cleanup: use braces for sources in intern/
2023-09-17 09:05:40 +10:00
task.h
Cleanup: make class doc-strings directly above classes
2023-07-25 14:11:42 +10:00
tbb.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
texture.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
thread.cpp
Cleanup: spelling in comments
2024-04-01 16:47:57 +11:00
thread.h
Fix: Increase thread stack size for musl libc
2023-11-22 19:37:13 +01:00
time.cpp
Cleanup: use braces for sources in intern/
2023-09-17 09:05:40 +10:00
time.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
transform_avx2.cpp
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
transform_inverse.h
Cycles: Rename SSE4.1 kernel to SSE4.2
2024-02-09 17:25:58 +01:00
transform_sse42.cpp
Cycles: Rename SSE4.1 kernel to SSE4.2
2024-02-09 17:25:58 +01:00
transform.cpp
Cleanup: use braces for sources in intern/
2023-09-17 09:05:40 +10:00
transform.h
Cycles: improve equiangular sampling in volume
2024-03-25 13:02:02 +01:00
types_float2_impl.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_float2.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_float3_impl.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_float3.h
Change packed_float3 to internal float3 for HIP
2023-08-15 15:40:29 +02:00
types_float4_impl.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_float4.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_float8_impl.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_float8.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_int2_impl.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_int2.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_int3_impl.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_int3.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_int4_impl.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_int4.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_int8_impl.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_int8.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_spectrum.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_uchar2_impl.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_uchar2.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_uchar3_impl.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_uchar3.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_uchar4_impl.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_uchar4.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_uint2_impl.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_uint2.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_uint3_impl.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_uint3.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_uint4_impl.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_uint4.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types_ushort4.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
types.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
unique_ptr.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
vector.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
version.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
windows.cpp
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
windows.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00
xml.h
License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:53:23 +10:00