Iconsistent 3DGS view-dependent rendering

[phoenixbf]

Hi all
I'm encountering an issue related (possibly?) to sh, or how the splats view-dependent color is rendered.

I'm attaching here a SOG example (https://superspl.at/view?id=95b9b97d) to replicate the issue: see how different is rendered on supersplat (right) and sparkjs (left). For instance highlights on chocolate (front edge) seems almost absent on the left screenshot

Is there a way to control this behaviour?
I already tried tweaking several SparkRenderer parameters, but so far without luck

[phoenixbf]

Ok so, after some tests,
it looks like when SparkRenderer.autoUpdate = true, view-dependent color is correct.

On the other hand, when using SparkRenderer.autoUpdate = false and calling manually SparkRenderer.update({ scene }) like suggested in the docs, view-dependent color is not updated correctly (see above reference image on the left).

Am I missing some other Spark routine that needs to be called manually?

[mrxz]

For properly updating view-dependent effects, you'll have to pass a viewToWorld matrix when manually updating. The following should work:

sparkRenderer.update({ scene, viewToWorld: camera.matrixWorld });