Automotive CAD models - RT GPU - 1070 8GB enough RAM?

[Morne]

Hi all

So we've all seen the pretty car renders done by various people using RT.

BUT...
Will those renders be possible with RT GPU using GTX 1070 8GB if the model was imported CAD data (Catia)? I mean I have a bumper for example, when imported the bumber alone results in a 1.3GB Max file.
So if I have an entire car exterior, including accessories you're looking at a HUGE max file (and xrefs)

[vlado]

How many triangles is that? 8 GB can fit quite a lot of stuff.

Best regards,
Vlado

[Morne]

The grill, bumper and front lights in the 1.3GB file says:
Polys 18.6 Million
Verts 9.8 Million

[DaveKW]

I'm not sure how representational this is but we have a file (8.5Gb xref'd into a lighting scene) that's 98 mil tris with 15k+ objects in the scene and it maxes out our Titans X's and cancels the render.

[Morne]

I'm not sure how representational this is but we have a file (8.5Gb xref'd into a lighting scene) that's 98 mil tris with 15k+ objects in the scene and it maxes out our Titans X's and cancels the render.

Are those Maxwell Titans or Pascal Titans?
That's what I'm worried about. So basically you guys fall back to normal traditional Advanced Production CPU then?
How much RAM is plugged into motherboard?

[DaveKW]

Maxwell's and 128Gb. Yeah we use Adv for all of our work.

[Morne]

Have you guys tried the new IPR in advanced (from 3.5)?
Maybe thats a suitable replacement until GPU catch up and get more RAM?

[DaveKW]

No, until we get these current projects finished we're sticking with 3.4 until we can test 3.5.

[kosso_olli]

The grill, bumper and front lights in the 1.3GB file says:
Polys 18.6 Million
Verts 9.8 Million

I fear that this is way over the top. For comparison, the data we use here for print resolution is about 2 million polies for the parts you mentioned, around 25 million for the whole car, including interior. Such a car fits into the video ram without problems. The tesselation is fine enough even for closeups.

[Morne]

...around 25 million for the whole car, including interior. Such a car fits into the video ram without problems. The tesselation is fine enough even for closeups.

Then I can change the import settings to something lower res, good to know

[Syclone1]

I've been using a modifier I think called pro optimizer and it's been working great to cut poly's but still keep the model looking great.

-Dave

[savage309]

Have you guys tried the new IPR in advanced (from 3.5)?
Maybe thats a suitable replacement until GPU catch up and get more RAM?

V-Ray GPU is used for production and previz, automotive included, for quite some time (more than a few years) now. However, the CPU versions will always have more features.
1 million faces take about 250MB RAM (more if they are motion blurred). Also, there are GPU with 24 and even 36 GB of RAM available.

Best,
Blago.

[Morne]

Also, there are GPU with 24 and even 36 GB of RAM available.

Best,
Blago.

Those aren't available to us mere mortals

[AC5L4T3R]

Last few weeks I've been using RT to shade nothing but full car CAD data on my 1080 and it's been no problem.

[munderwood]

Converting the body objects to vray proxies will save a lot of ram.