really slow rendering times

[cullen]

I'm having a problem with the speed of my renderings. I'm now using Max 6 where I was using Viz 4 previously.

 

What I'm running into is, a model that is only taking like 10seconds to render in VIZ is taking about 15 min in MAX. the only lights I have are free spots with Ray Traced Shadows. Two Materials in the scene. black raytrace and frosted glass.

 

Does anyone have any suggestions? On the time frame for this project, I can't work with this much of a delay. orangesad

 

Thanks,

crw

[William Alexander]

Check all of the raytracing parameters. Default settings that you may have changed from viz, global/ local parameters with the raytraced glass, Lights shadow trace depth, Antialiasing super sampling..

 

I would really look close at the raytrace depth for the reflection and refraction.

 

Camera have a depth of field?

 

Every Viz file I've brought into max seemed to work the same. Although not with this much glass.

 

rgrds

WDA

[cullen]

I decide to let one render all the way through to see how long it was really taking.

 

Here where my results:

 

As you can see this image isn't complex at all and I can't figure out why in the world it would take that long!!!

 

I've tried the adjustments that you have suggested and really didn't see any major difference. Looking at these settings can you suggest any possible solutions?

[abicalho]

Raytrace Shadows are not affected by the Raytracer controls.

 

Try using Adv Raytracing shadows instead. Or try playing with the Quadtree Depth values.

 

Alexander

[cullen]

thanks for the tip on the adv raytrace. That cut the render time down to 8min and 34sec.

I'm sorry but I'm not familiar with the quadtree depth. Can you explain that for me?

 

Do you think that 8.5 min is still a bit long?

[William Alexander]

Cullen,

 

Sorry about the confusion with shadows & raytracing. Used raytrace in tooo broad of scope. Max Quad tree depth in the raytraced shadow parameter of the light. Lower settings helps. The advanced shadows are better for your scene anyway.

 

If the raytraced black material & glass have reflections refractions, decreasing the Global Max depth may speed things up. Try and see if the quality of reflections is acceptable.

[Vince Paske]

I've found raising the quadtree depth to 10 really speeds things up, especially with larger scenes (in the raytrace shadow parameters).

In the Raytracer globals, try setting the cutoff threshold to .15, and in the Raytrace Acceleration Parameters, try setting the balance to 8.

You can read about these parameters in the help file if you want to learn more. Good luck. :ngesmile:

[erleo]

I agree with calvino56. Raising Quadtree depth to 10 will incredibly decrease rendering time on raytrace shadows. Just don't mix it up with another 'shadow mapped' light, it really slows things down.

 

Max Quadtree Depth refers to the balance between processor and memory / ram. Setting it to 10 means the rendering will depend more on caching it to your RAM, which means faster process especially if you have a large physical ram (ie, 1GB and up) However, setting it lower means the rendering highly depends on the speed of your processor. Lowering the Quadtree depth is highly recommended for FAST CPUs with LOW RAM.

[cullen]

Thanks for the help everyone. Changing that value to 10 seems like it as almost cut the rendering time in half.

 

Thanks,

crw

[CVC]

can U post your scene and we can try do it ??