Render Time...?

[kimdracula]

where do the rendering time really differ? Is it solely with how much loaded your CPU is? or the setting/preset plays a big role in rendering for example a complex exterior building... I've tried rendering with a Dual Core pros. but still took me nearly 6 hrs to render a 640x480 picture lol,... I think the way I set my setting is busted...

[variks]

Re: Render Time...?

I have the same problem. When I'm doing a small render 320x240 without global light and with my own one light, the render takes about one hour.
Which settings must i change?

[Eric West]

Re: Render Time...?

Apologies - I am new to this.
Has there been any response to this issue? I share the same render time problems. It is almost to the point of making the software unuseable, which I can't believe is correct.

My model is fairly complex and I am sure that contributes to the problem - but does this mean there is a limit to the info you can have in vray and sketchup? Should I be using other software - like rhino and v-ray?

[dalomar_cg]

Re: Render Time...?

Chances are you're using QMC (which is on by default), which is the slowest calculation method. Irradiance Mapping is really quick, so I'd recommend using that. Check out the training manual for more details on IR and other details about calculation engines.

[Eric West]

Re: Render Time...?

Thanks for the quick response.
Unfortunately I already tried irradiance mapping (see attached screen capture).

Could the size of the sketchup file (which is big at 10meg) effect render time?

The intent is to produce detailed architectural renderings. Currently we use rhino and viz. But sketchup has advantages. Is sketchup/vray slower than rhino/vray?

[dalomar_cg]

Re: Render Time...?

If you're using IR then its probably more of tweeking. Usually one of the biggest culprits is having a max rate of 0, which is causes the process to take a good deal longer and shows very few improvements over a max rate of -1 or -2 (depending on resolution). I can't actually see your settings because the image is too low res, so it may be better just to post the visopt file.

The size can effect render time, but thats mostly for your scene set up time.

As far as vfsu versus vfr, if I had to choose only one, then I would go with vfr(to be honest I am highly biased, but I'll state my reasons). There are 2-3 main reasons, with the highest one on the list being the scene/render set up time. Because of how SU organizes all of their geometry, the larger the file gets, the longer it takes us to get the scene ready to render it. Rhino is significantly quicker then SU, but thats just a limitation of the platform itself...not to much more we can do with it.

The second one is going to be that you're materials are going to be generally easier to deal with within Rhino. Material settings and everything are going to be the same, but things like texture mapping, managing UV directions, and general viewport feedback is going to be much better in Rhino. Some of this will change within the SR, but not enough to make me recommend Rhino over SU.

Lastly, you're going to have much more control over you're geometry with Rhino as opposed to sketchup. This isn't really a rendering thing, but renderings start from geometry. So having as much control over that is going to lead to better renderings. Some of my best renderings are due to great models as opposed to highly detailed materials, complicated environments, or pulling tricks left and right. Good geometry is a little under emphasized in rendering, but thats my personal opinion.

Hope this helps out.

[Eric West]

Re: Render Time...?

Thanks again,

I agree. Once the geometry gets complicated sketchup really bogs down.
Tried the same model in rhino vray and the renderings are going much better.

decision made.

[Eric West]

Re: Render Time...?

Just to follow up - The problem was really that I had way too many surfaces with reflective qualities. When I removed the reflective properties from the aluminum the model rendering in 3 minutes.
The reflection was not necessary for this rendering. It was only there because it came with the default material.
A quick test for future issues like this would be to toggle the reflection/refraction in global switches.

Thanks again

[dalomar_cg]

Re: Render Time...?

That definitely would be a contributer. Try to keep reflections to a "minimum" in the sense that you only have reflections on things that need it. Also, having glossy reflections/refractions will cause things to be slower.