merge BufferGeometrys to one draw call

[arpu]

Hello,

any idea why this Mesh cannot be merged to 1 draw call?
https://drive.google.com/file/d/1m1obz6W1au9R8O1RuOR2_0CtQqQDYI9r/view?usp=sharing

input: 482 nodes, 322 meshes (542 primitives), 0 materials, 0 skins, 0 animations
input: 542 mesh primitives (1224865 triangles, 760036 vertices); 542 draw calls (542 instances, 1224865 triangles)
output: 2 mesh primitives (37192 triangles, 17240 vertices); 2 draw calls (2 instances, 37192 triangles)
output: 1 nodes, 1 meshes (2 primitives), 0 materials
output: JSON 1828 bytes, buffers 135680 bytes
output: buffers: vertex 89442 bytes, index 46229 bytes, skin 0 bytes, time 0 bytes, keyframe 0 bytes, instance 0 bytes, image 0 bytes
stats: vertex POSITION: compressed 59457 bytes (27.6 bits), raw 137920 bytes (64 bits)
stats: vertex NORMAL: compressed 29985 bytes (13.9 bits), raw 68960 bytes (32 bits)
stats: index index: compressed 46229 bytes (3.3 bits), raw 223152 bytes (16 bits)

[zeux]

This was a rare problem caused by the order of different internal optimization steps; fixed in #263

[arpu]

works! you are the best!