Week2

VAT vs USD Instancing Test

Jan 14

HAVE COMPLETED:

TO-DO LIST:

Last week, I tested two different pipelines (USD and VAT) to transfer Yichen’s fern simulation from Houdini to Unreal

Try VAT Instancing in Houdini and Unreal
Try a different method of Instancer in Houdini and test its performance in Unreal
Try USD Instancing in Unreal

USD INSTANCING IN HOUDINI:

USD has two types of instanceable primitives and point instancing.

Point instancing: Try to test different methods of point instencing. I have 15 ferns to test the file size.

Point Instancer: The ferns doesn't have animation in Unreal.

Instanceable Reference: It worked

Reference: It worked

Instanceable Inherit: It worked

Inherit: It worked

Instanceable Specialize: It worked

Specialize: It worked

Result： All of them have similar performance and same file size.

USD INSTANCING IN UNREAL:

VAT

I am gonna test the formula to see if VAT can work. (frame_count * point_count)/texture_size, see if it's over 9000. I reduced the hairs of fern and the polygon is now 25,861. And according to the formula, the result is 757.6, so it was rendered really fast and exported successfully, so I think if we use Opacily texture in lowpoly geometry, that should be cool.

Next Week:

Try USD variants and PDG