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Cycles: replace spot light disk sampling with sphere sampling #109329

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Weizhen Huang merged 12 commits from weizhen/blender:spot_light_to_sphere_light_with_cone into main 2023-07-07 17:15:24 +02:00
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Weizhen Huang commented 2023-06-24 21:36:50 +02:00
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The spotlight is now treated as a sphere instead of a view-aligned disk.
The implementation remains almost identical to that of a point light,
except for the spotlight attenuation and spot blend. There is no
attenuation inside the sphere. Ref #108505

Other changes include:

Sampling

Instead of sampling the disk area, the new implementation samples either
the cone of the visible portion on the sphere or the spread cone, based
on which cone has a smaller solid angle. This reduces noise when the
spotlight has a large radius and a small spread angle.

Before After
spot_size_before.png spot_size_after.png

Texture

Spot light can now project texture using UV coordinates.

Normalization

Previously, the normalization factor for the spotlight was \pi r^2,
the area of a disk. This factor has been adjusted to 4\pi r^2 to
account for the surface area of a sphere. This change also affects point
light since they share the same kernel type.

Versioning

Some pipeline uses the Normal socket of the Texture Coordinate node for
projection, because ls->Ng was set to the incoming direction at the
current shading point. Now that ls->Ng corresponds to the normal
direction of a point on the sphere (except when the radius is zero),
we replace these nodes with a combination of the Geometry shader node
and the Vector Transform node, which gives the same result as before.
versioning.png
Example file see https://archive.blender.org/developer/T93676

The spotlight is now treated as a sphere instead of a view-aligned disk. The implementation remains almost identical to that of a point light, except for the spotlight attenuation and spot blend. There is no attenuation inside the sphere. Ref #108505 Other changes include: ## Sampling Instead of sampling the disk area, the new implementation samples either the cone of the visible portion on the sphere or the spread cone, based on which cone has a smaller solid angle. This reduces noise when the spotlight has a large radius and a small spread angle. | Before | After | | -- | -- | |![spot_size_before.png](/attachments/04ea864a-6bf9-40fe-b11b-61c838ae70cf)|![spot_size_after.png](/attachments/7077eaf9-b7a8-41b1-a8b6-aabf1eadb4f4) ## Texture Spot light can now project texture using UV coordinates. <video src="/attachments/6db989d2-7a3c-4b41-9340-f5690d48c4fb" title="spot_light_texture.mp4" controls></video> ## Normalization Previously, the normalization factor for the spotlight was \(\pi r^2\), the area of a disk. This factor has been adjusted to \(4\pi r^2\) to account for the surface area of a sphere. This change also affects point light since they share the same kernel type. ## Versioning Some pipeline uses the `Normal` socket of the Texture Coordinate node for projection, because `ls->Ng` was set to the incoming direction at the current shading point. Now that `ls->Ng` corresponds to the normal direction of a point on the sphere (except when the radius is zero), we replace these nodes with a combination of the Geometry shader node and the Vector Transform node, which gives the same result as before. ![versioning.png](/attachments/5bbfcacc-26c5-4f7f-8360-c42bcd851f68) Example file see https://archive.blender.org/developer/T93676
spot_size_after.png
213 KiB
spot_light_texture.mp4
1.5 MiB
versioning.png
134 KiB
spot_size_before.png
210 KiB
🚀 5
Weizhen Huang added 8 commits 2023-06-24 21:37:02 +02:00
Weizhen Huang force-pushed spot_light_to_sphere_light_with_cone from be50dcdca8 to a20393238b 2023-06-24 21:41:58 +02:00 Compare
Weizhen Huang added this to the Render & Cycles project 2023-06-24 21:42:46 +02:00
Weizhen Huang added the
Module
Render & Cycles
 label 2023-06-24 21:43:08 +02:00
Weizhen Huang added 1 commit 2023-06-24 22:06:52 +02:00
Weizhen Huang added 1 commit 2023-06-26 11:28:06 +02:00
Weizhen Huang requested review from Brecht Van Lommel 2023-06-26 15:28:51 +02:00
Brecht Van Lommel approved these changes 2023-07-03 13:36:27 +02:00
Brecht Van Lommel left a comment
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Let's also wait with landing this one, and do it together with other possibly compatibility breaking changes.

Let's also wait with landing this one, and do it together with other possibly compatibility breaking changes.
Weizhen Huang added 1 commit 2023-07-07 17:10:14 +02:00
Weizhen Huang merged commit 9fe87646d5 into main 2023-07-07 17:15:24 +02:00
Weizhen Huang deleted branch spot_light_to_sphere_light_with_cone 2023-07-07 17:15:25 +02:00
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Reference: blender/blender#109329
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