TransformAccess to float4x4, make it fast

I have an IJobParallelForTransform in which I use TransformAccess to do some transformation. However, TransformAccess does not have the matrix values like Transform has. I had to derive the matrix which uses at least one matrix multiplication.

Code (CSharp):

1. private struct Job : IJobParallelForTransform {
2.     public void Execute(int index, TransformAccess transform) {
3.         float4x4 rotationTranslationMatrix = new float4x4(transform.rotation, transform.position);
4.         float4x4 scaleMatrix = float4x4.Scale(transform.localScale);
5.         float4x4 matrix = math.mul(rotationTranslationMatrix, scaleMatrix);
6.         // ... Use matrix for transformations
7.     }
8. }

Is there any way to avoid the matrix multiplication? It could have been if TransformAccess has stored Transform's matrix.

 

Just use LocalToWorld component instead of TransformAccess? It's already got the transform matrix.

 

I can't, as much as I want to. I'm using hybrid approach and I can't easily turn the existing setup into pure ECS.

 

I haven't used hybrid in a long time, but unless something has changed I'm pretty sure you can still have position/rotation/etc components on hybrid entities which will create a LocalToWorld component. Then just add a CopyTransformFromGameObject component to update them.

 

I see. That's an interesting idea. I'll give it a try.