How to encode triangle strips?

[FreddyFunk]

Hello,

I saw the file "mesh_stripifier.h" and am courious, how to initialize a Draco Mesh with triangle strips and if the C++ Encoder and Decoder could handle triangle strips with primitive restart or with degenerated triangles in a Mesh as input.

Kind Regards

[ondys]

mesh stripifier is used only to generate triangle strips out of an existing draco::Mesh but draco::Mesh itself does not support triangle strip representation. If you want to encode triangle strips with draco, you need to "unroll" the strips to regular tri-list representation and then stripify the decoded mesh (but the strips will be most likely different compared to the input mesh)

[FreddyFunk]

Ok, thank you for this information. Do you know which algorithms have constraints that prevent the draco encoder to work directly on triangle strips?

[ondys]

The main algorithm used by Draco is based on the Edgebreaker method that encodes the connectivity in a specific pattern that does not follow triangle strips. Strips could be theoretically encoded directly with the sequential encoding method, but we currently don't have a support for that

[guanprco]

Hi @ondys,

Draco implementation has references to mesh sequential encoding in a few places:

• class MeshSequentialEncoder cf src/draco/compression/mesh/mesh_sequential_encoder.h
• class MeshSequentialDecoder cf src/draco/compression/mesh/mesh_sequential_decoder.h

Is sequential encoding now supported, meaning it should be possible to use Draco to exchange triangle strip?

Regards,