As far as night time lighting with mr, i got great results with the lume night lens effect. This scene is set up with two standard (kind of dark purpleish) omni lights, one is set up as a the main light, the other is just to fill in the shadows a bit. The shadows are raytraced. All the trees and bushes are from the aec follige.
Lighting & MR Advice Exchange
47Gut
#36
arona
#38
another topic with MR. its only an idea from me. i dont like mentalray at all. i used some other third party renderers and when im comparing⌠. the main problem i see in MR is its speed. only an idea:shrug:.
eks
#39
anyone have something about this subject?
as i see there are 3 lights:
- standard
- mental ray
- photometric
i did a simple test and did not noticed any change between standard and mental ray lights. unfortunately, i still do not have a good place to post the images, altought there aint much thing.
all tree lights, with final gathering, took 5 minutes and a half. visually the difference is only between photometric and the other two, altought an âarea shadow effectâ i could only get with mental ray light with ray traced shadows. :shrug:
anyone have any experience with different light types with mental ray?
eks
arona
#40
maby another problem. mentalray in some cases like this is limited :D. lighting in mentalray seems too weak to me.
eks
#41
i strongly disagree with arona in one point, but agree in another.
i do think lighting and shadows makes mental ray stand out. but it definitly is slow.
so, any one have tips about mental ray optimization? to reduce it´s render time without too much loss of quality?
eks
joske
#42
mental ray can be as fast as other solutions
only the room for error is a lot smallerâŚ
once you know the âtricksâ it is possible to have acceptable rendertimes
there is no golden solution, just try untill you find your workflow that suits you
and look around and search in forums like this how other people do itâŚ
and if you still donât like⌠pls stop complaining and donât use it 
Sir_Vuclan
#43
Even though the direct lighting problem was posted a while ago, maybe other can benifit from this info.
First of let me clear the issue that the sun does NOT casts soft shadows. It cast hard defined shadows, that being because all the light rays from the sun are parallel, which is what a direct light is. If you have a pole and follow the shadow during the day it does apper to fall off or become lighter the further you get away from the pole. But the fall off is do to the light scattering in the sky and reflecting back down to the ground and lighting the surface. So to make the soft shadows in MR you would have to enable GI and or FG and then the shadows will look more realistic and have soft shadows like the picture Herbert West posted.
I am currently experimenting alot with mental ray to accuritly light a House that I am modeling and one of my biggest challenges is to get the interior lit correctly with only the daylight system. The interior is always to dark, not enough light is bounced. If anyone has any tips, please post them.
I think this is a very useful thread if as many people posted as in the Photon shading thread by Jeff Patton, and I hope to help as I figure out more settings and tweaks
AdrianWilliams
#44
hay jeff i rendered that scene that you posted it work great but theres a small prob with the light in the courners of the room they seem the give off funny shadows like patches that move strange when the balls move around?
JeffPatton
#45
Youâll have to increase the final gather and/or GI settings to get rid of those artifacts. Naturally, that will increase the render times too though.
joske
#47
Vulcan, have a look at the shadow/light the sun casts from your window onto the floor of a room : it will be very hard near the window, the further it falls, the less sharp it will be.
So there is allways a small âarea shadowâ even from the sun. It might be very small, but it is there for sure :wise: really, just have a look yourselfâŚ
so even for sun you might not wanna use a direct light.
secondly using a daylight system for interiors might not be such a good idea : the skylight is almost useless for interiors, imhexp. it is better to use area omnis (the size of the window) outside just infront of each window instead
this way you will have less probs getting the light inside brighterâŚ
Waple
#48
Vulcan, what about placing some bounce lights around the room (area lights that exclude the thing theyâre bouncing from, like a floor bounce light excludes the floor) with very low multipliers, and color of what theyâre bouncing off of (like a bounce light from a blue table casts a blue bounce light).
Or is that cheating for what youâre trying?
Sir_Vuclan
#51
hi, sorry I havenât been around for a while, but I have been working on the lighting with the daylight system and radiocity. which works very well as long as you use the advanced lighting material and tweek the settings. I have pictures but I dont have enough posts to upload them. On the other hand, the daylight system is useless with the mental ray renderer so I would use bounce lights like Waple said.
francescaluce
#53
I want area shadows with a target light⌠but mr wont let me, area shadows are turned on⌠but just dont work unless the light is an omni or spotâŚ
but if possible I want to use a direct light as I have done beforeâŚ
you canât, by definition⌠until arealights work on an âareaâ⌠âdirectional/infinite lights ignore any area specifications because the size of a light at infinite distance does not matterâ⌠or if you want until they are positionless thereâs nothing to âmoveâ to get blurred shadows and lightwrapping as the classic arealights do⌠the buildin probably use a pseudoarea workaround⌠the best thing for outdoor sun like environments is an hibrid shadow that cover the great distances with fast shadowmaps and near the details call raytraced shadows⌠they are called in mr âdetailed shadowmapâ⌠but they are available with the 3.3⌠so with max7 probably.
ciao
francesca
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