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Fix #115998: Cycles volume too dark when shadow ray visibility is off #126139

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Weizhen Huang merged 3 commits from weizhen/blender:fix-volume-shadow-visibility into main 2024-08-19 15:52:57 +02:00
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Weizhen Huang commented 2024-08-09 15:36:20 +02:00
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when tracing shadow ray through a volume and no hit is registered, we
consider the whole ray segment inside the volume.

However, no hit registered could also happen when the volume is
invisible to shadow ray. We should explicitly check this case and skip
rendering the volume segment instead.

when tracing shadow ray through a volume and no hit is registered, we consider the whole ray segment inside the volume. However, no hit registered could also happen when the volume is invisible to shadow ray. We should explicitly check this case and skip rendering the volume segment instead.
Weizhen Huang added this to the Render & Cycles project 2024-08-09 15:36:36 +02:00
Weizhen Huang commented 2024-08-09 15:48:47 +02:00
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Note that the tests camera_in_volume_camera_and_volume and camera_in_volume_camera_only fail, because the volume in those scenes are invisible to shadows. With this fix, the volume does not occlude itself and becomes brighter.

Note that the tests `camera_in_volume_camera_and_volume` and `camera_in_volume_camera_only` fail, because the volume in those scenes are invisible to shadows. With this fix, the volume does not occlude itself and becomes brighter.
Weizhen Huang requested review from Sergey Sharybin 2024-08-09 16:01:36 +02:00
Weizhen Huang requested review from Lukas Stockner 2024-08-09 16:01:48 +02:00
Lukas Stockner approved these changes 2024-08-10 02:16:13 +02:00
Sergey Sharybin requested changes 2024-08-14 17:29:46 +02:00
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Sergey Sharybin left a comment
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Correct and consistent way of getting visibility for the current path is to use path_state_ray_visibility().

Correct and consistent way of getting visibility for the current path is to use `path_state_ray_visibility()`.
Weizhen Huang commented 2024-08-15 16:47:10 +02:00
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path_state_ray_visibility() requires ConstIntegratorState and state->path, but volume_shader_eval() uses ConstIntegratorGenericState and might require shadow_state->shadow_path, I can not call this function directly.

I could write a version of the function that is compatible with shadow paths, but what situation does this function resolve? It feels like an overkill, as the path_flag is just PATH_RAY_SHADOW for shadow paths.

intern/cycles/kernel/integrator/shade_volume.h Line 79 in 58aa349f68
volume_shader_eval<true>(kg, state, sd, PATH_RAY_SHADOW, volume_read_lambda_pass);

`path_state_ray_visibility()` requires `ConstIntegratorState` and `state->path`, but `volume_shader_eval()` uses `ConstIntegratorGenericState` and might require `shadow_state->shadow_path`, I can not call this function directly. I could write a version of the function that is compatible with shadow paths, but what situation does this function resolve? It feels like an overkill, as the `path_flag` is just `PATH_RAY_SHADOW` for shadow paths. https://projects.blender.org/blender/blender/src/commit/58aa349f689c1bf15118603e51a2c7b49869d88a/intern/cycles/kernel/integrator/shade_volume.h#L79
Sergey Sharybin commented 2024-08-15 17:17:08 +02:00
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Ah, there is this difference indeed.
On a quick thought we can move integrate_intersect_shadow_visibility to path_state.h (with an updated name).

Ah, there is this difference indeed. On a quick thought we can move `integrate_intersect_shadow_visibility` to `path_state.h` (with an updated name).
Weizhen Huang force-pushed fix-volume-shadow-visibility from 79c1a7698e to a5b8165b59 2024-08-19 14:44:48 +02:00 Compare
Weizhen Huang added 1 commit 2024-08-19 14:46:31 +02:00
Sergey Sharybin approved these changes 2024-08-19 14:47:37 +02:00
Weizhen Huang added 1 commit 2024-08-19 14:58:58 +02:00
update test images
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Weizhen Huang commented 2024-08-19 14:59:21 +02:00
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@blender-bot build

@blender-bot build
Weizhen Huang merged commit be0d2e19b5 into main 2024-08-19 15:52:57 +02:00
Weizhen Huang deleted branch fix-volume-shadow-visibility 2024-08-19 15:53:00 +02:00
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Reference: blender/blender#126139
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