About shape groups/assemblies

[KelSolaar]

About shape groups/assemblies

[chaosink]

Maybe you can try my script: rm_instance.
It can convert instance and shapegroup shapes into non-instanced shapes.
Maybe buggy... : )

[wjakob]

Hi @KelSolaar,

instancing is one of the features that we haven't yet ported to Mitsuba 2. We are currently looking into this, as it is obviously an important feature.

Best,
Wenzel

[KelSolaar]

Sweet thanks @wjakob!

@chaosink : I searched for group in the entire codebase and could not find anything, hence my thread. Bookmarked your repo for future reference though!

Cheers,

Thomas

[chaosink]

@KelSolaar Try searching shapegroup instead.

[KelSolaar]

Unless I missed something super obvious (and as I stated it earlier), nothing like that in Mitsuba 2!

[chaosink]

@KelSolaar Convert instance and shapegroup shapes in XML files to non-instanced shapes.
Is this what you want?
Or I misunderstood you needs?

[KelSolaar]

I need to be able to take a bunch of shapes, group them and transform that group.

For example, I have that ColorChecker geometry here: https://github.com/colour-science/colour-mitsuba/tree/master/colour_mitsuba/colorchecker_classic/geometry. I want to assemble it a the origin of the world, group everything under a group/assembly and then move that group at the location I wish. At the moment I have to export everything at the final worldspace location, e.g. against the Cornell Box wall for that precise ColorChecker geometry.

Hope that makes sense!

[chaosink]

I mean, you can first generate a XML scene file for Mitsuba1 just as before.

In the past, with Mitsuba 1, I have been relying on translators to export data for me so it never has been an issue.

And then, use this Python script rm_instance to convert instance and shapegroup shapes in XML to non-instanced shapes, for the lack of instance in Mitsuba2.

Finally, use Mitsuba2 to render the converted scene.

This is only a workaround, which may consume more memory than using instance.

[KelSolaar]

Well, I'm generating the scene manually now! I could compute the transformations and slot them as required but it is a stretch too much for my liking and not really efficient.

Cheers,

Thomas

[Speierers]

I am going to close this. Instancing and shape grouping is on our roadmap.