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View Full Version : exclude from FG by material ?

MikeBracken
02-24-2009, 10:35 PM
Hello. I am trying to find a way to exclude Materials from FG calculations. For example, I would like to exclude the leaves of a tree from the FG calcs, but I do want the trunk/branches to be included in the calcs. I know that I can detatch the leaves and set these settings in there object properties. But the problem with this is that when I want use Pflow, GroundWiz, etc, I cant seem to "scatter" groups. So I need to keep them as one object. (And I will also be baking them to proxies). I have tried every setting I can think of in the rayswitcher (transmat, material to shader, output, etc) with no luck.
Any Ideas on how to make this work ?


Regards,
Mike
Glacierise
02-25-2009, 11:45 AM
have you tried turing the FG multiplier in the A&D material to 0?
thorsten hartmann
02-25-2009, 11:52 AM
hi mike,


the raytypeswitcher is correct. Use for FG a A&D Material and set the cutout value to zero, then have you 100% Air and the FG canīt find it. The most speed problem is not the fg, it is the alpha maps from your leaves + FG calculation. I use a normal A&D Material without Maps, only the color (green for leaves, brown for trunk), that is fast.
MikeBracken
02-25-2009, 02:15 PM
glacierise....Thanks for the response. This will keep from rendering the FG per material but the calcs are still there. I have a massive amount of veg to render and FG is just to slow. I usually use AO for the trees, but I like the look of the fg on the trunk and branches. And it doesnt take long to calculate.


Thorstan...... Thanks ! This works well. I just save the FG, change the materials back, and render.
BTW....I almost never use opacity maps for leaves, they just take to long to render if there is alot of veg in the scene.
Thanks again !

Regards,
Mike
Glacierise
02-25-2009, 02:21 PM
Reducing the blur amount to the minimum .01 speeds up alpha map renders, but they ares till slow yeah.
jigu
02-25-2009, 03:29 PM
if you are using max 2009, then make sure to use BSP2 engine... It makes rendering fast. Also renders really good(a bit faster) with lots of objects having transperency. Make sure you aren't using double sided max material for leaves.. It makes rendering slow.
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