Unreal Engine Issues
Unreal Engine Issues
Opcode shader compilation error when using a TextureSampleParameterCubeArray node with hardware ray tracing enabled
UE - Rendering Architecture - Materials - Mar 31, 2025Materials containing a cube array texture sampling node will not compile when hardware ray tracing is enabled. The shader compilation error indicates that an invalid op code was used: "Opcode Sample ...
High Virtual Texture Sample/Lookup Cost when using a Virtual Texture in a Material Layer Blend
UE - Rendering Architecture - Materials - Mar 14, 2025Some Material Attribute blends in Material Layer Blends can cause Virtual Texture samples to be duplicated in HLSL. This can be avoided by sampling the Virtual Texture in the Parent Material, and pa ...
Resetting material instance parameters to default value does not update the appearance of the object that the material is applied to
UE - Rendering Architecture - Materials - Mar 10, 2025When a material instance with exposed parameters is applied to a landscape; the parameters set to a new value and then reset to back the default value, the landscape does not respect the new default ...
Crash when creating a Material Instance of a Material with Material Attribute Layers expression connected to a Substrate Convert Material Attributes.
UE - Rendering Architecture - Materials - Mar 8, 2025A UDN user has reported this crash [Link Removed] The user also reports that the editor will crash:If the material is loaded while in PIE.If the material is used in a level (crash occurs when the l ...
Shader info strings overlap in MaterialInstanceEditor and are unreadable
UE - Rendering Architecture - Materials - Jan 24, 2025CL-35369646 changed the debug information string to span multiple lines, but the Y offset moves forward by only one line, so the string overlaps. ...
Material Parameter in Static Switch Branch of True Controlled by Quality Switch Not Showing Up in Material Instance Panel
UE - Rendering Architecture - Materials - Jan 23, 2025In material editor, if a quality switch node is used together with a static switch to control branch, material parameters in the 'true' branch will never show up in the Detail panel of material inst ...
Params in material instance disappear when grouping is changed in material with a material layer
UE - Rendering Architecture - Materials - Jan 11, 2025If there is a texture parameter within a specific material attribute stream in the base material and also within the base material layer, they must have the same parameter group otherwise the parame ...
Duplicated TextureLoadVirtualPageTable in GetCustomData functions in generated HLSL add to the total instruction count due to TextureLoad having side effects
UE - Rendering Architecture - Materials - Dec 4, 2024When using materials with CustomData inputs, such as the Eye material with Iris Distance and Mask, Virtual Texture samples will increase the instruction count for each unique VTPageResult. Each cus ...
Bindless Virtual Textures are sampled with non-virtual samplers
UE - Rendering Architecture - Materials - Nov 28, 2024Texture Collections can contain virtual textures. There is no way to inform TextureObjectFromCollection that the texture is virtual, only that it is a Texture2D. This texture object is then sampled ...
Updating Material does not update platform stats in derived Instance
UE - Rendering Architecture - Materials - Nov 26, 2024It would seem that updating a material does not update the associated platform stats in a material instance editor, only the parameters. Can workaround by manually invoking shader compile in the ma ...