Sketchfab Forum

Alembic and lights

(Gilles38) #1

Hi all,
maybe the staff an comment on this.
I have exported a short animation from Blender (Alembic format) and I get incomplete shadow casting.

When I use the triangulation option for the export, then shadows are fine (although the animation looks somehow like a Stop Motion, I don't know why, I think all the objects have a constant vertex number throughout the animation).

Here my export option (no triangulation here)


Weird! Can you post links to the two versions?

(Gilles38) #3

Hi James, sorry for the late reply.
Hope this helps:

Alembic 'raw'

Alembic with 'triangulation':

(Gilles38) #4

and the same 'raw' Alembic with no triangulation but with a 'ground' is OK !
Any clue about this from you guys? (Sorry I didn't take time to put the textures)

(Gilles38) #5

This shadow problem isn't seen when light1 and/or light 2 are spots (instead of 'Direction') perpendicular to the scene but it appears when I rotate the spot with the resulting shadow ressembling my first model in Alembic 'raw'.
Hope this helps

(Gilles38) #6

Hi @james, anyone among the satff to look at this ?
To summarize my tests, I would say that Direction lights behave as Spot lights but I am not sure...


Sorry for the delay. I don't have an update yet, but @paul_sketch mentioned that the bounding box is very strange on the quad version.