su2rad: problems with texture mapping

radiance-general
1

Dear List (Thomas ?)

I have been experimenting a little with getting geometry into RADIANCE by exporting to 3ds formation from 3ds Max, importing into SketchUp, and then exporting to RADIANCE using su2rad.

So far I have only tested simple models, for example a 1x1x1 meter cube, with all six faces textured with the same square image.

I export in "by color" mode, as that has been most successful thus far.

I attach a .jpg of the result. I have tried a million different things in SketchUp to try to get rid of the uv-mapping problem which is very evident in the attach render.

Any suggestions? When exporting a more complicated (sculpture) model, textured with a single "marble" albedo map, the same uv-mapping problem is experienced.

Best,
Claus

[cid:[email protected]]

2

Hello Claus

Unfortunately the texture export in su2rad is not very sophisticated. It's
not a good way to produce Radiance textures anyway.

To solve your problem you can try one of the two options:

1) Select all the textured faces, right click and choose "texture -> make
unique" from the context menu. This will create six identical materials with
a uniform mapping for each face.

or 2) Use the attached script to export the cube to *.obj and then use
obj2mesh to convert the *.obj file to a Radiance mesh with textures. The
author of this OBJ exporter says it does the "make unique" step during the
export. Please note that I have not used this script myself and I don't know
if it modifies your materials during the export.

Regards,
Thomas

OBJexporter.rb (26.9 KB)

···

2011/4/18 Claus Brøndgaard Madsen <[email protected]>

Dear List (Thomas ?)

I have been experimenting a little with getting geometry into RADIANCE by
exporting to 3ds formation from 3ds Max, importing into SketchUp, and then
exporting to RADIANCE using su2rad.

So far I have only tested simple models, for example a 1x1x1 meter cube,
with all six faces textured with the same square image.

I export in “by color” mode, as that has been most successful thus far.

I attach a .jpg of the result. I have tried a million different things in
SketchUp to try to get rid of the uv-mapping problem which is very evident
in the attach render.

Any suggestions? When exporting a more complicated (sculpture) model,
textured with a single “marble” albedo map, the same uv-mapping problem is
experienced.

Best,

Claus

3

Hello Thomas,

Well, I tried both your suggestions to no avail.

Then I more or less stumbled upon a "solution". If I avoid placing any part of the geometry in octants with negative coordinates then texturing works with no problems.

Have no idea why that would be the case, though.

After export I can !xform the object to any octant of the scene no problem...

Best,
Claus

···

From: Thomas Bleicher [mailto:[email protected]]
Sent: 18. april 2011 14:57
To: Radiance general discussion
Subject: Re: [Radiance-general] su2rad: problems with texture mapping

Hello Claus

Unfortunately the texture export in su2rad is not very sophisticated. It's not a good way to produce Radiance textures anyway.

To solve your problem you can try one of the two options:

1) Select all the textured faces, right click and choose "texture -> make unique" from the context menu. This will create six identical materials with a uniform mapping for each face.

or 2) Use the attached script to export the cube to *.obj and then use obj2mesh to convert the *.obj file to a Radiance mesh with textures. The author of this OBJ exporter says it does the "make unique" step during the export. Please note that I have not used this script myself and I don't know if it modifies your materials during the export.

Regards,
Thomas

2011/4/18 Claus Brøndgaard Madsen <[email protected]<mailto:[email protected]>>

Dear List (Thomas ?)

I have been experimenting a little with getting geometry into RADIANCE by exporting to 3ds formation from 3ds Max, importing into SketchUp, and then exporting to RADIANCE using su2rad.

So far I have only tested simple models, for example a 1x1x1 meter cube, with all six faces textured with the same square image.

I export in "by color" mode, as that has been most successful thus far.

I attach a .jpg of the result. I have tried a million different things in SketchUp to try to get rid of the uv-mapping problem which is very evident in the attach render.

Any suggestions? When exporting a more complicated (sculpture) model, textured with a single "marble" albedo map, the same uv-mapping problem is experienced.

Best,
Claus

4

Claus

This is a fairly unexpected solution. If none of the other methods worked
this seems to be more a problem with SketchUp than the scripts. Which
version of SketchUp are you using?

Regards,
Thomas

···

2011/4/19 Claus Brøndgaard Madsen <[email protected]>

Hello Thomas,

Well, I tried both your suggestions to no avail.

Then I more or less stumbled upon a “solution”. If I avoid placing any part
of the geometry in octants with negative coordinates then texturing works
with no problems.

Have no idea why that would be the case, though.

After export I can !xform the object to any octant of the scene no problem…

Best,

Claus

5

Thomas,

I have SketchUp version 8.0.4811 installed. I installed it no more than 2 weeks ago...

Claus

···

From: Thomas Bleicher [mailto:[email protected]]
Sent: 19. april 2011 18:43
To: Radiance general discussion
Subject: Re: [Radiance-general] su2rad: problems with texture mapping

Claus

This is a fairly unexpected solution. If none of the other methods worked this seems to be more a problem with SketchUp than the scripts. Which version of SketchUp are you using?

Regards,
Thomas