Matrix Multiply?

In my jobs I have a fair few Matrix4x4.MatrixMultiply3x4(Vector3) floating around, what is the best way of doing those using simd methods or should I just keep them as they are?

 

As far I am aware, burst with jobs are well optimized for matrix operations.
There was some comparison floating about, or probably even it was on one of GDC talks.
Sorry I don't remember. You could try look on SIMD matrix operation, or maybe search even youtube and GDC?

My understanding is, it should be already optimized for SIMD.
Hence if you need them just use them. If in doubt, run some benchmark and stress test.

 

Don't use the old "Matrix4x4" etc. types, instead use Unity.Mathematics' float4x4 etc. types, since they are mapped to SIMD registers.
Use "math.mul()".

 

Thanks for the reply. It seems I was confused by a float4x3 * float3 giving a float4. So the next question is, is there a method to cast/convert a Matrix4x4 to a float4x3 or do I need to copy the elements directly?

 

You want to loose column. But multiplying matrices don't work that.

Depends what type of multiplication you are doing. What you actually want to multiply by?
There are some solution. Mostly related to transformations, position, scaling, rotation. But if you got some custom equation, you may need to do each element multiplication by a hand.

 

No its a standard replacement for Matrix4x4.MultiplyPoint4x3 of a vertex position, so bog standard pos, rot, scale matrix.

 

Have a look this thread
https://forum.unity.com/search/3872150/?q=MultiplyPoint&t=post&o=date&c[node]=147+583+422+425

Besides math.mul, there was some discussion, on equivalent DOTS tranlstions of matrixes.

 

Many thanks for your help