Microsoft KB Archive/184917

HOWTO: Reduce Motion Blur Calculations

PSS ID Number: Q184917 Article last modified on 04-30-1998

IRIX:3.7,3.71; WINNT:3.7,3.71

IRIX winnt

================================================================ ==

The information in this article applies to:

 SOFTIMAGE 3D for IRIX, versions 3.7, 3.71 == SOFTIMAGE 3D for Windows NT, versions 3.7, 3.71 == 

= SUMMARY =

This article offers a method for reducing motion blur calculations.

= MORE INFORMATION =

To reduce motion blur calculations when rendering with mental ray, set the -time_contrast R G B values to adjust the granularity of time oversampling. The R G B values (red, green, and blue) can be set between 0 (zero) and 1, with the default at 0.1 0.1 0.1.

Using a value of 0.99 0.99 0.99, the blur produces a noisy, grainy motion blur. Values between 0.1 0.1 0.1 and 0.5 0.5 0.5 increase render speed, while producing an acceptable blur.

= Setting the -time_contrast to 0.5 0.5 0.5 on Windows NT =

You can use one of the following two methods:

Option A
Edit Setenv.bat, [this sets up all the SOFTIMAGE 3D (SI3D) environment variables)], then modify the SI_MI_TRACER value to the following (enter this on one line):

set %SI_MI_TRACER=%SI_LOCATION%_ray.exe -time_contrast 0.5 0.5 0.5

Option B
To render an .mi file (for example, Out.mi), enter the following at the SI3D command prompt:

ray.exe -time_contrast 0.5 0.5 0.5 out.mi

= Setting the -time_contrast to 0.5 0.5 0.5 on IRIX =

You can use one of the following two methods:

Option A
Edit your .softimage file (this sets up all the SI3D environment variables), then modify the SI_MI_TRACER value to the following (enter this on one line):

setenv SI_MI_TRACER $SI_LOCATION/mental_ray/bin/ray.irix5 -time_contrast 0.5 0.5 0.5

Option B
To render an .mi file (for example, Out.mi), enter the following on the command line:

ray.irix5 -time_contrast 0.5 0.5 0.5 out.mi

= REFERENCES =

If you have any questions concerning the information contained in this article, contact support@softimage.com by e-mail.

= Additional query words: si si3d si3dren si3dmr =

Keywords : si si3d si3dmr si3dren Version : IRIX:3.7,3.71; WINNT:3.7,3.71 Platform : IRIX winnt Issue type : kbhowto ============================================================================= Copyright Microsoft Corporation 1998.