ShadeTree - Mental Ray Frequently Asked Questions
You're bound to come across problems while using the software.
We've tried to document every possible problem users have
encountered, and to list the solutions here.
For the most up-to-date version of the FAQ's, please refer to
the Cinema Graphics website. Often we
will update the website with common questions about a new release
after it has gone out.
If your problem isn't in list below, contact us via email
1.0.0 - COMMON QUESTIONS
You need to have the Microsoft Visual C++ compiler installed to
compile Mental Ray shaders.
Does the command '...\ray.exe' exist?
Is the SI_LOCATION environment variable set correctly?
Type 'echo %SI_LOCATION%' on the commandline.
Environment variable can be changed by launching the System program
from 'Start->Settings->Control Panel'. Click on the 'Environment'
tab. Select the 'System Variables' pane and edit or enter the
Bring up the Render Options Editor ('Render->Render Options'), and make
- 'Trace' is on
- 'Shadows' is on
- 'Shadow Factor' is a value less than 1.0 (try 0.25)
Make sure 'Para-Approx' in the Render Options Editor is set correctly.
A value of 1.0 will give a shrink-wrap look for displacements. Crank this
number up to slow your renders, but improve details in displacements.
An html tutorial is available on this subject. See the
ShadeTree Mental Ray page
... and click on the tutorial link that describes using ShadeTree and
If you encounter errors in this document, please email
[email protected] with
the URL, and enclose an example of the erroneous text, and what you
feel to be the corrections, if possible.
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