google
how to correctly close deduplication
I try close deduplication by removing the definition DRACO_ATTRIBUTE_INDICES_DEDUPLICATION_SUPPORTED and DRACO_ATTRIBUTE_VALUES_DEDUPLICATION_SUPPORTED
but I get bad compress result: I set qp - 11 qt - 10 qn -0 qg - 0 the compress seems ok when cl is between -5 to -10. when cl is set to -0 to -4 I get very big .dro file, about 106% the size of the original file
@MovingZ Are you using draco_encoder and passing negative flag values? Please note the text from the application usage:
Use negative quantization values to skip the specified attribute
@MovingZ Are you using draco_encoder and passing negative flag values? Please note the text from the application usage:
Use negative quantization values to skip the specified attribute
Already solved the problem by set deduplicate_input_values_ of obj_decoder to false. Thanks
By the way, can different attributes share the same point mapping?
I made a new decoder for the my mesh data format. Compared with LZMA, the average compress rate is 32%, but the rate of some meshes is only about 9%. I wonder how I can get a better compression.
I use SetUseBuiltInAttributeCompression(false) and use LZMA on the top of draco. It works better, but still not good enough on some meshes, compared with using LZMA directly
For some reason I can't share the model. But I can give the model info and data format:
IndexCount: 12786 VertexCount: 12690 VertexFormat: P3F_N4B_T2F + T4H_B4H + W4B_I4B (7 attributes: P3F - position, T2F - texcoord, others(including normal) - generic
The description of the mesh is stored in another xml file, the mesh data ONLY include mesh indices and vertices.
A: The mesh data is a bin file with raw data: indices and vertices. I use LZMA to compress it.
B: I write a new encoder to read my xml file and mesh data file. put those raw data into 7 draco attributes. Each attributes has the same indices map. Here are the options I encode with draco: -cl 6 -qp 11 -qt 10 -qn 0 -qg 11 (because my normal data is not float, I put it into generic)
After some tests, I also set SetUseBuiltInAttributeCompression(false) and use LZMA on the top of draco to improve the compression
