Question Can't expose any of the Matrix properties

Hello, so we are not able to expose even the Matrix4x4 property which is supported by the shaders (SetMatrix/GetMatrix), or am I missing something?

 

I have the same issue. If you create the property, you cannot set the Tickbox "Expose". You can Create A Matrix node by right clicking -> Create Node -> e.g. Matrix/Matrix4x4and then right click on the node -> convert to -> Property (than the box is automatically ticked), but the generated code till does not show the Matrix as exposed uniform.

 

You can't expose matrices because Unity's material inspector & serialization doesn't support matrices. If you want an exposed matrix you need to use 4 Vector 4 properties and combine them into a matrix in the graph. If you plan on setting the matrix via script, which is usually the case when you're using matrices, then there's no need for it to be exposed. You can still use

SetMatrix()

on the material to set the value.

 

the issue is if we can not enable the expose option,the generated code will put the float4x4 property outside the CBUFFER_START(UnityPerMaterial) Block,which will cause shading error when enable the srp batch options.the urp will share wrong property between materials.

 

I'd report this as a bug then. Still probably don't want it "exposed" as I wouldn't expect them to add support to the material class or inspector for matrices, but perhaps a "per material" option specifically for matrices would be a nice add.

Though they'll probably just tell you to use multiple Vector4 properties instead.

 

I am trying to create a custom decal projector. The VP matrix is set via script, determining the decal's position. If _VPmatrix is not an exposed property, then all the decal materials will share the same _VPmatrix, making all the decals overlap. In URP I put

float4x4 _VPmatrix;

into CBUFFER so that different materials can have different _VPmatrix. The result looks nice but I am not sure if this is the right solution?