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» » » » Post: Re: Color of imported furniture is always grey

Print at Dec 18, 2025, 1:33:31 PM

Posted by Keet at May 20, 2024, 9:24:48 PM

Re: Color of imported furniture is always grey
Several possible causes:
1. The "usemtl <materialname> in the obj file has no reference in the mtl file to "newmtl <materialname>.
2. The importer can't find the mtl file. The obj file should have a line close to the top with "mtllib <filename.mtl>" and "filename.mtl" should be in the same directory as the obj file.
3. The format of the mtl file is not standard Wavefront or is missing the needed values for Sweet Home 3D. And looking at your example that is the most likely reason. If you change the Kd into Ka you will see a little more I think but that still is very little information to work with.
Read the manual MTL_file_explained.pdf to get a better idea about what is needed in a MTL file. A regular newmtl block looks like this:

(Sweet Home 3D export, color)

newmtl MyMaterialName
illum 2
Ka 0.0 0.0 0.0
Kd 0.25 0.25 0.25
Ks 0.0 0.0 0.0
Ns 1.0
Ni 1.0

(Blender export, texture)

newmtl MyMaterialName
Ns 0.000000
Ka 0.000000 0.000000 0.000000
Kd 0.250000 0.250000 0.250000
Ks 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2
map_kd texturefilename.jpeg

ETA: if you change the color after import in Sweet Home 3D and export again you can see what is generated in the MTL file. If you export with a different obj file name it will not overwrite your original.
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Dec 18, 2025, 1:33:31 PM