Meshlab crashes when loading polygonal obj files with more than one textures

[WuKongBlog]

The meshlab version I use was MeshLab2021.07d_nightly_f60c934-windows.

I have an polygonal OBJ file along with a corresponding MTL and several PNG textures. However, I found that if I only use one of the two (whichever) material meshlab opens the file alright. But if I use two simultaneously, meshlab crashes on start-up.

Here is a small example, If I comment out one of these lines “usemtl material0000” “usemtl material0001” ，the file can be opened normally, otherwise it will crash.

building.mtl

newmtl material0000
Ka 1.000000 1.000000 1.000000
Kd 1.000000 1.000000 1.000000
Ks 0.000000 0.000000 0.000000
Tr 1.000000
illum 1
Ns 1.000000
map_Kd building_material0000_map_Kd.png
newmtl material0001
Ka 1.000000 1.000000 1.000000
Kd 1.000000 1.000000 1.000000
Ks 0.000000 0.000000 0.000000
Tr 1.000000
illum 1
Ns 1.000000
map_Kd building_material0001_map_Kd.png

building.obj

mtllib building.mtl
v 21609.599609 -19086.248047 3.616000
v 21609.396484 -19088.847656 3.616000
v 21610.871094 -19088.962891 3.616000
v 21611.074219 -19086.363281 3.616000
v 21609.396484 -19088.847656 6.252000
v 21609.599609 -19086.248047 6.252000
v 21609.687500 -19088.597656 6.252000
v 21609.849609 -19086.541016 6.252000

vt 0.007812 0.893926
vt 0.737985 0.893926
vt 0.737985 0.887149
vt 0.749180 0.887149
vt 0.749925 0.887149
vt 0.772749 0.941363
vt 0.749925 0.992188
vt 0.740763 0.992188

vn -0.531657 0.618713 -0.578391
vn -0.619826 -0.532613 -0.576315
vn 0.530562 -0.620543 -0.577435
vn 0.620633 0.530640 -0.577266
vn -0.438676 -0.376952 0.815764
vn -0.375599 0.437102 0.817232
vn 0.438296 0.377597 0.815670
vn 0.376069 -0.436521 0.817326

usemtl material0000
f 1/1/1 2/2/2 3/3/3 4/4/4 

usemtl material0001
f 5/5/5 7/7/7 8/8/8 6/6/6

[WuKongBlog]

PS：Here is a similar question meshlab-crashes-when-loading-obj-files-with-more-than-one-png-textures

[alemuntoni]

Same issue of #982, #796, #239

[alemuntoni]

fixed here. Will be available in the next version of meshlab, which will be released in the next days.