Voxel cone tracing doesn't work on 4.4.0-beta 5

[meriaizen86]

Release Type: Beta

Version: 4.4.0-beta 5 (works on 4.3.0.2507 and previous versions)

Platform(s): Windows 11 25H2 26200.9168

Describe the bug
The scene does't render, instead it pops up the following error message:

Error: One or more errors occurred. (One or more errors occurred. (Error: The method or operation is not implemented.. System.NotImplementedException: The method or operation is not implemented.
   at Stride.Shaders.Parsing.SDSL.AST.AccessorChainExpression.CompileHelper(SymbolTable table, CompilerUnit compiler) in /_/sources/shaders/Stride.Shaders.Parsers/Parsing/SDSL/AST/Expression.cs:line 1286
   at Stride.Shaders.Parsing.SDSL.AST.AccessorChainExpression.ProcessSymbol(SymbolTable table, SymbolType expectedType) in /_/sources/shaders/Stride.Shaders.Parsers/Parsing/SDSL/AST/Expression.cs:line 780
   at Stride.Shaders.Parsing.SDSL.AST.AssignExpression.ProcessSymbol(SymbolTable table, SymbolType expectedType) in /_/sources/shaders/Stride.Shaders.Parsers/Parsing/SDSL/AST/Expression.cs:line 90
   at Stride.Shaders.Parsing.SDSL.AST.ExpressionStatement.ProcessSymbol(SymbolTable table) in /_/sources/shaders/Stride.Shaders.Parsers/Parsing/SDSL/AST/Statements.cs:line 36
   at Stride.Shaders.Parsing.SDSL.AST.BlockStatement.ProcessSymbol(SymbolTable table) in /_/sources/shaders/Stride.Shaders.Parsers/Parsing/SDSL/AST/Statements.cs:line 225
   at Stride.Shaders.Parsing.SDSL.AST.ShaderMethod.ProcessSymbolBody(SymbolTable table, SpirvContext context) in /_/sources/shaders/Stride.Shaders.Parsers/Parsing/SDSL/AST/ShaderElements.MethodOrMember.cs:line 506
   at Stride.Shaders.Parsing.SDSL.AST.ShaderClass.Compile(SymbolTable table, CompilerUnit compiler) in /_/sources/shaders/Stride.Shaders.Parsers/Parsing/SDSL/AST/Shader.cs:line 616
   at Stride.Shaders.Compilers.SDSL.SDSLC.Compile(String filename, String code, ObjectId hash, ReadOnlySpan`1 macros, ILogger log, ShaderBuffers& lastBuffer, CompileOptions options) in /_/sources/shaders/Stride.Shaders.Compilers/SDSL/SDSLC.cs:line 73))

To Reproduce
Steps to reproduce the behavior:
1.

Create a new project with Voxel Cone Tracing Forward renderer (Ensure to have the right deps: Stride.Voxels) and add a Voxel lightning.

Expected behavior & screenshoot

this result as we can see in the screenshoot, showing the ray bouncing into the sphere simulating a mirror effect.

instead, we got this in 4.4.0-beta 5:

MyGame2.zip

Log and callstacks
If any, please attach here any log or callstack (preferably in a .txt file using GitHub drag and drop)

Additional context
added project solution.
MyGame2.zip

[Ethereal77]

this result as we can see in the screenshoot, showing the ray bouncing into the sphere simulating a mirror effect.

Do note that if you refer to Stride.Voxels that voxel cone tracing is only for approximating global illumination, i.e., to voxelize the scene around the camera and trace and propagate the diffuse lights to "simulate" bouncing. It has nothing to do with tracing rays in the raytracing sense and your mirror ball example.

[meriaizen86]

Thanks for the proper explaination.

[meriaizen86]

Aside this, can anyone give a try if it's present a malfunction in the Voxel cone tracing GI ilumination that causes the scene fails to render?

[Nicogo1705]

There was a (lot of) issues in beta5, did a PR to make it work again.

Thanks for finding it, I learned a lot of things, hope my fixs are right, reviewers will have some work :)