OCC layer rendering problem

[x_kelvin]

I creat a maya scene and want to render the OCC layer. I create the
occlusion layer from the presets. I find that the scene render
correctly if the scene is open entironment or outdoor, but it isn't
correct if the scene is close entironment. For example, the scene is
inside of pCube as a house. I have already reversed the normal and
setup two lights for this pCube, but the rendering result is the
whole dark image.
How can I solve the problem?

thanks

[aen]

Hi Kelvin...

Glad to hear your toon rendering is working...

For indoor occlusion to work properly you have to play with the shader
parameters: max distance and spread (higher samples will get rid of a grainy
texture). For occlusion lighting I just use ambient lighting (a skydome for
outdoor shots) to get a even shading effect, you could try (?) turning off your
lights and turning on the pCube's shader incandescence to create ambient
lighting (the cube should have no bottom or a separate non incandescent plane).

I've only used mental ray occlusion layers for single frame renderings.
Once I get the layer basically working I take it to Photoshop and tune it up,
before multiplying or overlaying it with the other passes. You can spend a
lot of time trying for the best Maya rendering, but I found that getting a
basically correct rendering and then tweaking it inside Photoshop is much faster
(saturation control is a problem in Maya).
For an animation al compositor I'm using PhotoShop CS3 Extended,
you can rendering your animation while directly use Photoshops effects to a
specific layer for the entire animation. It works OK, but there is no sound
channel.

hth's aen...

[x_kelvin]

Dear aen
yes its working correctly and thanks a lot for your eagerness.
thanks and regards again.

kelvin

[DTrel]

Yeah...well, I'm trying to learn the proper mind set to create a good tutorial.
I'm working on a Maya Mel tutorial to explain basic algebraic geometry.

A point divides a line into two,
a line divides a plane into two, and
a plane divides 3D space into two.

Points dividing a line is just simple algebra: x < 5 .
Lines dividing a plane is 2D line/slope algebra: y = mx + b;
Planes dividing 3D space is the "DOT PRODUCT".

The dot product is a basic and essential operation. You use the dot product
everywhere in 3D Mel Coding from cut faces tool to aim constraints to
backculling, and for some reason its never explained. Some of the Mel scripts at
highend3d.com are missing the dot product, the programmers have created long
complex scripts to bypass the problem.

Coming soon to highend3D.com: Maya_Mel_Math_1.avi - a short dot product video
tutorial. This is packaged with a fully working game (the simple tetrahedron
version of rubics cube) which is the example Mel coding for the dot product
video.

aen