当加载具有多个 png 纹理的 obj 文件时，Meshlab 崩溃

Question

我有一个 OBJ 文件以及相应的 MTL 和几个 PNG 纹理。我使用 meshlab 打开它。 This mesh file downloaded from free3d 未在 MTL 中指定纹理 PNG 文件。所以我自己添加了它：

map_Kd [texture_file_name.png]

由于有多个纹理，我在两个不同的地方添加了两行map_Kd。但是，我发现如果我只使用两个（取其中一个）map_Kd 命令之一，meshlab 可以正常打开文件。但是如果我同时使用两个，meshlab 会在启动时崩溃。

我在终端中试过运行，它显示如下：

正确打开（只有一个map_Kd）：

user@computer:~/data/Bikes2/obj_with_text/3/OBJ$ meshlab Sepeda\ Facific\ Invert.obj 
Qt: Session management error: Could not open network socket
Current Plugins Dir is: /snap/meshlab/36/usr/lib/meshlab/plugins 
Shader directory found '/snap/meshlab/36/usr/share/meshlab/shaders', and it contains 19 gdp files
Mesh is Polygonal!
libpng warning: iCCP: known incorrect sRGB profile
LOG: 0 Opened mesh Sepeda Facific Invert.obj in 519 msec
LOG: 0 All files opened in 521 msec
libpng warning: iCCP: known incorrect sRGB profile

启动时崩溃（两个 map_Kd 命令）：

user@computer:~/data/Bikes2/obj_with_text/3/OBJ$ meshlab Sepeda\ Facific\ Invert.obj 
Qt: Session management error: Could not open network socket
Current Plugins Dir is: /snap/meshlab/36/usr/lib/meshlab/plugins 
Shader directory found '/snap/meshlab/36/usr/share/meshlab/shaders', and it contains 19 gdp files
Mesh is Polygonal!
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
Segmentation fault (core dumped)

有谁知道为什么？是 meshlab 错误还是我做错了什么？

如果重要的话，我正在使用 Ubuntu20.04 和从 Ubuntu 软件中心安装的 Meshlab_64bit_fp v2020.12。

更新 1： Meshlab_64bit_fp Windows 10 上的 v2020.03 行为相同。

更新二：

为了使其可重现，我 post 下面是我的 MTL 文件。我添加的两个 map_Kd 命令分别在第 184 行（newmtl col_rangka_wadah_perr 下）和最后一行。

# Blender MTL File: 'Sepeda Facific Invert.blend'
# Material Count: 29

newmtl Material
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl Material.002
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl Material.003
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl Material.004
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl Material.005
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl Material.006
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl Material.007
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl None
Ns 0.000000
Ka 0.000000 0.000000 0.000000
Kd 0.800000 0.800000 0.800000
Ks 0.800000 0.800000 0.800000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl ban_luar.001
Ns 94.117647
Ka 1.000000 1.000000 1.000000
Kd 0.064007 0.064007 0.064007
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl col_ban
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl col_casing_hp
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl col_jari2
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl col_lantai
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl col_master_btl
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl col_pegangan_stank
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl col_pelek
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl col_rangka_per_sepeda
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2


newmtl col_rangka_wadah_perr
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2
#map_Kd uv_rangka.png

newmtl col_uv_btl
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl dominan.001
Ns 94.117647
Ka 1.000000 1.000000 1.000000
Kd 0.800000 0.800000 0.800000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl gear.001
Ns 94.117647
Ka 1.000000 1.000000 1.000000
Kd 0.800000 0.800000 0.800000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl guma.001
Ns 94.117647
Ka 1.000000 1.000000 1.000000
Kd 0.301176 0.301176 0.301176
Ks 0.447059 0.447059 0.447059
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl skp_front_defaul.001
Ns 94.117647
Ka 1.000000 1.000000 1.000000
Kd 0.800000 0.800000 0.800000
Ks 0.447059 0.447059 0.447059
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl steel_whiter.001
Ns 94.117647
Ka 1.000000 1.000000 1.000000
Kd 0.589804 0.589804 0.589804
Ks 0.447059 0.447059 0.447059
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl uv_ban_kanan
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl uv_ban_kiri
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl uv_hp
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl uv_pelek_kanan
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2

newmtl uv_pelek_kiri
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2
map_Kd uv_pelek_kiri.png

Answer 1

可以确认这似乎是 meshlab OBJ 导入程序中的错误。

我已经使用批处理 meshlabserver 程序管理了一个解决方法。

我编辑了 mtl 文件以使用 map_Kd filename.png 行添加多个纹理，方法与您相同。
使用命令行转换文件：

meshlabserver -i Sepeda\ Facific\ Invert.obj -o fixed.obj -m wt

并得到一个 meshlab 可以正确加载的文件：

当加载具有多个 png 纹理的 obj 文件时，Meshlab 崩溃

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

3d

textures

meshlab

mtl-file