View Full Version : XSI Texture Limit

08 August 2007, 09:53 AM
is there a limit as to how many texture maps one can apply to different objects in one scene?

ive been texturing with high res textures with a number of different objects and it has been rendering properly until now. yesterday i applied another texture to an object and the render region would just sit there and do nothing until i remove textures from one object.

it seems like i've exceeded the limit. is there such limit?

any suggestions as to how i may get around this problem? i've tried the "delete cache after render region" option but that hasn't worked.

by the way i've got final gathering on. when i work with normal spots, it renders ok.

08 August 2007, 12:07 PM
There's no real limit in the software afaik, but know that all your textures are gonna be cached in your ram, so probably the bottleneck lies there.
What you should try is to convert your texture files to the mental ray .map format (that way they're read from your HD when they're needed) and see what happens.

08 August 2007, 12:18 PM
I just reread your post and saw the FG thing.
Another thing you can try is optimise your FG calculation using the ray_type (or ctrl_rays) node.
Plug a simplified material (smaller/no texture maps, no blurred reflections, etc) into the FG port of the ray node to make the FG calculations a lot lighter.

08 August 2007, 07:45 PM
thanks karelVR!

sounds like good do i apply them exactly?

i know that in the preferences folder there is the option "automatically convert images to .map files". will that convert my textures automatically?

also, how do i apply the ray_node? can you give me step by step examples as to how i can do this?

thanks so much!

08 August 2007, 09:38 PM
.map files:
Yes, you can set it in the preferences, or better: at the bottom of the optimization tab under your render/regionrender settings you can set the automatic .map generation on.
You'll see it will automatically call the imf_copy program to convert it and it will put the new .map files in a mr_map folder.

ray type:
here's a simple example:

You have the complex material plugged into the eye port of the ray_type node, and a simplified version (in this case no texture maps) in the FG port.
Take care that you set the FG option in the ray_type node to "use FG port" instead of the standard "use eye port".
Depending on what you need/can get away with, it can speed FG calculations up tremendously.

Good luck!

08 August 2007, 09:38 AM

you're awesome. your fg trick worked! it renders very slowly but im happy that it actually renders! do you have any other specifics that you think might help?

thanks ALOT!

08 August 2007, 08:57 AM
You're welcome ;)

The only thing I can think of right now that could possibly speed up your renders too is tweaking your bsp settings. There's some info about it on the site, also there's the useful pdf by dave lajoie (but can't find it at the moment).

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08 August 2007, 08:57 AM
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