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Cycles: add instancing support in light tree #106683

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Weizhen Huang wants to merge 10 commits from weizhen:light_tree_instance into main
pull from: weizhen:light_tree_instance
merge into: blender:main

When changing the target branch, be careful to rebase the branch in your fork to match. See documentation.
Conversation 11 Commits 10 Files Changed 12 +1197 -365

10 Commits

Author SHA1 Message Date
Weizhen Huang 49ede3338d Merge branch 'main' into light_tree_instance 2023-04-14 18:48:44 +02:00
Weizhen Huang c10023b8e3 Add `#include <variant>`
buildbot/vexp-code-patch-coordinator Build done. Details
2023-04-14 16:59:37 +02:00
Weizhen Huang a8e5aa4bcc Merge remote-tracking branch 'origin' into light_tree_instance
buildbot/vexp-code-patch-coordinator Build done. Details
2023-04-14 16:36:24 +02:00
Weizhen Huang 490f41856b Change light tree node type from `union` to `variant` 2023-04-14 16:33:27 +02:00
Weizhen Huang f69d27edae Fix variable used without initialization 2023-04-14 14:54:41 +02:00
Weizhen Huang 13a876dff7 Fix transform zero vector in volume
buildbot/vexp-code-patch-coordinator Build done. Details
2023-04-14 00:24:32 +02:00
Weizhen Huang a56f7e1244 Parallelize iterating over mesh lights and building subtrees 2023-04-14 00:24:09 +02:00
Weizhen Huang e5b9a1050f Merge branch 'main' into light_tree_instance 2023-04-13 23:23:28 +02:00
Weizhen Huang 8f9a92e3d7 Readability improvement based on reviews 
`lamp` -> `light`
`mesh_to_tree` -> `object_to_tree`
Explicit naming of union structs (`leaf`, `inner`, `instance`,
`triangle`, `light`, `mesh`)
`enum LightTreeNodeType` -> `enum LightTreeNodeType : uint8_t`
 2023-04-13 23:15:04 +02:00
Weizhen Huang dec90cfcf9 Cycles: speed up light tree build with many instanced mesh lights
buildbot/vexp-code-patch-coordinator Build done. Details 
by building a subtree for each unique mesh light.
The top-level light tree contains two types of emitters: lamps (local or distant) and mesh lights (emissive objects). Each unique mesh light, regardless of whether it's instanced or not, has a subtree. The leaf node of such subtrees only contain triangles. During traversal, we first traverse the top-level tree until we pick an emitter. If this emitter is a mesh light, we transform it to its local space and continue traversing its subtree until we pick a triangle.
 2023-04-07 18:40:03 +02:00