Hi there, I just had a shot where I had a metallic object inside an organic Tube (SSS mat) with some vraydisplacement on it and render times gradually went through the roof: Starting at an easy 10 Minutes per frame up to 3-4 hours per frame. Once I turned of Vraydisplacement, render times were ba…

Was it anything like your dynamic memory limit being hit? What was the map being used for your displacement?

Was “Static Geometry” ticked inside the vray displacement modifier? If not try that. It uses more RAM but it renders faster at least from my experience. *edit* ignore my post. I somehow skipped the whole part about some renders nodes hitting max on Memory usage. Sorry!

You could use a VRayOverrideMat on the tube and the metallic object. Then use a simple non-reflecting material for the GI and reflection rays. Also limiting your ray depth might help.

How much RAM is occupied during the rendering? Is the Displacement View Dependent or not? What are the Edge Length and Max Subdivs value? What is the Reflection Depth value for the Reflective material? What version/service pack of V-Ray/Maya/OS you are using?

Sorry for the late reply, I was busy getting the project done. For now I went with a layered solution (like my own suggestion) and that worked very well. Turning off the Vraydisplacement for the metallic layer pass didn´t really affect the look and I got the correct alpha from the non-metallic layer…

Right! So Max subdivs was probably quite high unless you’re doing something very fine being driven by a bitmap. A lot of people find that it’s less intensive to do some of the subdivision using a tesellate or turbosmooth before the vray displace and then use much less subdivs - you’d have to see wha…

I never go above 32 for displacement subdivs - usually keep it around 8 or 16 with a few levels of meshsmooth. makes a vast difference to memory usage and render times. Baking it all down to maps would help too - you’ll be able to cut your memory use in half and drop the time down a fair bit.

Well, the thing I don´t get is why the render times are just that high with reflective materials in it. Rendering just the environment without the reflective objects, but vraydisplacement with my settings renders blazing fast, that is why I didn´t even bother optimizing my displacement. I don´t bak…

I’d say that the displacement makes all the normals of your surface point in a far bigger spread of directions so it’s almost like changing from mirror reflections to glossy ones - where you previously had rays going in quite parallel directions that could converge easily to a clean solution, they’r…

That brings me to an idea…wouldn´t it be possible to implement a checkbox in the vraydisplacement mod to say “visible in reflections”, which would turn the displacement off for reflection/refraction rays somehow? In most cases the reflections are so distortet/glossy anyways, that noone could tell t…

Vraydisplacement&Reflections=horrible Rendertimes?

V-Ray V-Ray for 3ds Max Issues

Neilg November 25, 2014, 4:11pm 14

Oh, if it could automatically convert it to a normal map… that would be a great feature. the phoenix ocean does something similar turning it into a normal map when you’re far away but I dont know what controls that.

Topic		Replies	Views
displacement General	7	659	May 9, 2008
displacement options General	5	427	September 7, 2009
Displacement on Glass, long rendertimes General	10	465	October 27, 2011
Extreme rendertime with displacement Issues	8	426	January 19, 2010
Vraydisplacement Mod issues Issues	5	292	September 3, 2013

Vraydisplacement&Reflections=horrible Rendertimes?

Related topics