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ali-rahimi-shahmirzadi
02-13-2003, 07:13 PM
hi
i use a mental ray 1.5 for maya 4.5
i have a problem whit shadow . in my sence when camera is moving shadows in some area become flicker . and another problem is that the final image have a effect like grain maybe its for the low sample in global illum and final gather .this are my seting for my scenes . can anyone tell me what do i must to do? thanks a lot
____________________________
light type:point light
intensity:1
decay rate:quadratic
__________________________________
raytrace shadow attributes
use ray trace shadows:active
light radius:0.2
shadow rays:7
ray depth limit:1
_____________________________
caustic and global illumination
emit photons
energy : 1000.1000.1000
exponent:2
global illum photons:10000
______________________________
area light
type:disc
sampling: 4.4
low levwl:0
low sampling: 2.2
_____________________
mental ray seting
max reflection rays:2
max refrection rays:2
max ray depth:4
scanline:on
face:both
__________________
shadow mwthod:segment
shadow map:on
rebuild shadow maps:active
_________________________
global illum:active
global illum accuracy:300
global illum radius:0
photon volume accuracy:300
photon volum radius:0
max reflection photons:5
max refrection photons:5
max photon depth:5
photon map rebuild:active
____________________________
final gather:active
precompute photon lookup:active
final gather rays:200
min radius:0
max radius:0
final gathere rebuild:active


my home page:
http://www.ali-rahimi.com
stunndman
02-13-2003, 07:24 PM
show us a frame (and annotate the problematic regions)
uschi
02-13-2003, 08:13 PM
try locking the samples in the renderglobals
ali-rahimi-shahmirzadi
02-13-2003, 08:41 PM
i will try sample lock
and here is a image
stunndman
02-13-2003, 09:02 PM
hard to see what's wrong on a textured wall

if only your camera is moving you can reuse your photon maps (turn of rebuild and set a filename for the map)

don't leave the min/max radius settings for GI and FG at 0 - this means that mental-ray tries to figure them out by itself - and maybe this could change from frame to frame if there's anything moving - tune them by hand

this is just a personal experience but i never managed to get good results with point lights as photon casting lights - i prefer to use spotlights

edit: i have to correct my last statement - i have this experience with directional lights - not sure about point lights - but this could be irrelevant anyway
ali-rahimi-shahmirzadi
02-14-2003, 07:23 PM
i use a sample lock but no chang ?????
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