Applying Multiple Texture
Mappings to a Single Object in 3D Studio Max 2.5
by Jerry Sandefur
Two of the most annoying
problems associated with 3D object texture mapping are "stretching"
and visible seams. These problems can destroy an objects believability,
making them look artificial. Fortunately this has been addressed
in 3D Studio Max 2.5 and can now be minimized using the blend
material and multiple object texture mappings. Above is an example
of two spheres, one using normal spherical mapping and the other
using multiple mappings. The stretching problem is clearly visible
on the polar region of the sphere on the left, while the sphere
on the right although oriented in exactly the same position
shows no stretching.
In order to apply multiple maps to a single object, open the
Material Editor in 3D Studio Max 2.5 and create a "blend"
material (click the "standard" button and choose "blend"
from the list). You should see something similar to this:
The blend material allows
you to blend two maps together in any ratio desired. Click the
button next to "Material 1" in the blend material
roll-out and assign a diffuse map to it. In this case I am using
a bitmap but you can use any of the material types offered by
3D Studio Max. Do the same for "Material 2" in the
blend material roll-out but make one very important change,
in the "coordinates" area make sure you change the
"Mapping" option from "Explicit UVW 1" to
"Explicit UVW 2", this is what will make multiple
mappings possible later on. Here is an example of what it should
Return to the blend material roll-out and set the "Mix
amount" to 50. This will mix the two maps equally. Close
the material editor and select the object you want to apply
the maps to, then go to the "modifiers" panel in 3D
Studio Max and click the "UVW Map" button. Assign
a "planar" map to the object in the "Z"
axis, then click the "UVW Map" button again and assign
a spherical map to the object and make sure you assign it to
"Channel" 2, this is very important. This will assign
the "Explicit UVW 2" map you created earlier to your
object. That's all there is to it. It should look like this:
I originally read about this on the comp.graphics.packages.3dstudio
newsgroup, it was posted by Stefan
Jansson who got it from Steve Burk and it helped me so much
with this frustrating problem that I thought I would write this
tutorial for others that had not heard of this.