CGTalk - Render optimizing

pworks

02-27-2008, 11:51 AM

Hello,

Right now I try to render a little car, which looks a bit more realstic.
I am using mental ray, and for Lighning a HDR image I made. I use Final gather with follwoing settings:

Accuracy: 300
Density: 1
interpolation: 25
Min Radius: 0.27
Max: 2.7
Secondary Diffuse Bounces on

Ratraycing min samples 0 max smaples 2

The car has 630.000 polys smoothed

3d Motion Blur is on

I am rendering 1920X1080

So far so good, looks ok when I render it, so thats not the issue....the real issue is, one frame needs up to 11 min to render and I am sitting here in University and using Mental Ray sattelite with 7 quads meaning I got like 30 cpu´s rendering for me and I think this is way to long. I have some knowledge in rendering but I am no pro, so what is wrong, or what can I do to optimize the render?

edit:

some more info:
I am using mi_car_paint for the car, for color there is an file which is 1024X1024.
The HDR image is 1250X750.
I will use 2D Motion Blur now, but the images still takes 5 Min to render

fabergambis

02-28-2008, 03:06 PM

Try to use half density (0.5 I think it's enough), and maybe you can use a smaller resolution for your frames: don't you think that 1920X1080 it's a huge format for a video? :eek:
Then, is it really necessary to use a texture for the color of your car instead of a simple gamma correction node with a color assigned?
Does your IBL node emit light?

ghostlake114

02-28-2008, 07:08 PM

agree density is too high and lower will save tons of time

But, for car rendering as still, hours for a car is not a problem.
If you are going with animation, so I advice your FG like this.

density: 0.1
inter: 40

then a occ pass to fill detail.

Also what AA u r using, ur filter type (mitchell is best with still but is time consumer).

pworks

03-11-2008, 09:50 AM

hello, sorry for not getting back sooner, I was too busy.
Thanks to booth of you for the tips, I tried them afterwards and lowering the density helped.
I needed to use a texture because there is somethin written in the color and the hdr is emitting light and I used the Gaußsche filter
I already did most of the render, but for future tasks I will know ;)

cheers

edit: I also found out, that it will save lots of render time if you create lights from the HDR image instead of using emit lights...in case someone needs to know.

SirRender

03-11-2008, 06:24 PM

Sounds cool but how did you "create lights" from the HDR image in Maya?

pworks

03-11-2008, 08:44 PM

actually I didn´t create them, I just read about it. It is possible with hdr shop and an plug-in, but I can´t remember which one it was. It was also written, there are some disadvantages, I just overflew it.

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03-11-2008, 08:44 PM

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