Bump in XSI

[chur]

I have the next problem: how can I use 3D textures to create bump? If I convert color of 3D texture generator to vector I have some strange result. And how to mixs and mask the several bump maps?

[atyss]

You will find this useful:

http://www.edharriss.com/tutorials/tutoria...pmap\_mixing.htm

Hope this helps
Salutations - Cheers
Bernard Lebel

[chur]

Thank you! I inderstand now how to mix two bump-map.
But how to use 3D-textures to create projection-independent
patterns? If I connect it to bump-map genarator it gives me no effect. Direct connection to bump node (with convertion color to vector) gives me some strange bump on one half of object. How can I use 3D textures (3D_fractal for example) to bump?

[atyss]

You'll to "force" the coordinates by using a Texture_Space_Generator node. You will output this node in the Coord input of the 3D texture node. In the Space_Generator node, you will define the projection, and the 3D texture will use this projection.

I built an example for you:

You will have to plug the whole bump branch into the surface shader node, not the material node. Also, I used a Color_Correction node to adjust the contrast of the bump. You can combine several bump maps with vectorial nodes and mixers.

Hope this helps
Salutations - Cheers
Bernard Lebel

[chur]

I made this tree and it gives me a half-bumped sphere with some non-realistic bump. May be you can send me a scene? May addres is chursinm@mail.ru

[theallusionist]

Basically you can't use 3d textures as bumpmaps!
What a gip!!!!

Fractal sometimes gives a passable attempt at bumpmapping, but marble,vein,etc forget it

Soft/Mental Ray need to address this BUG asap

[chur]

Thank you. I've been solving this problem for a lot of time. It's strange that Avid hasn't fixed this bug yet.
So I will use textures tu bump.