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Projection modifier for cubemaps?
show user profile  rhumba
Hi, I have a cube with a cubemap texture assigned, and I have a geosphere (with a UV map) whose position is centred on the cube and just slightly larger. How would I render-to-texture a diffuse texture map for the sphere based on the cubemap using the projection modifier?

In other words, can I change a cube skybox into a spherical skybox, generating the texture automatically with 3dsmax? Thanks in advance,

Matt
read 601 times
2/11/2009 1:00:13 PM (last edit: 2/11/2009 1:00:13 PM)
show user profile  Dave
A quicker way might simply be to apply a turbosmooth to your box.

"I flew over Egypt once"

read 591 times
2/11/2009 1:34:54 PM (last edit: 2/11/2009 1:34:54 PM)
show user profile  rhumba
Hi Dave, thanks for replying. That's not my ideal solution though! =)
It would give me a very strange looking skybox... Ideally I want to minimise the texture distortion.

I guess I could just use something like HDRshop to change the mapping from cube to spherical, but with Max I could do so much more..!
read 552 times
2/13/2009 5:30:00 AM (last edit: 2/13/2009 5:30:00 AM)
show user profile  BishBashRoss2
You could render the scene with a 360 spherical cam.

Edit.

I mean, invert the normals of the mapped cube, and render with the 360 cam in the middle.





read 542 times
2/13/2009 6:13:36 AM (last edit: 2/13/2009 6:30:18 AM)
show user profile  rhumba
Hiya, that was a good suggestion. I went for that way of doing it, but found my tool in the Panorama Exporter (I don't seem to have 360 spherical cam in Max8).
Thanks for all help!

\-Edit-\

By the way, if anyone else is interested, this is how I did it:

Start with the cube, centred at the origin and texture mapped with the cubemap. Make sure the material has Self-Illumination at 100. The normals of this cube should face inwards, as is typical for skyboxes.
Place a free camera at the origin, pointing along the x-axis.
With the camera selected, choose Render->Panorama Exporter->Render..
Choose a nice largish image size and Render. Then export as a Spherical map (found in viewer->export).

That's it, you can try the new map out on a sphere. Reset and create a sphere (not geosphere), and assign this map you just made to this sphere. If all went well, it should be seamless and quite high res.
read 504 times
2/14/2009 2:32:05 PM (last edit: 2/14/2009 2:49:28 PM)
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