Vray rendering problem when scale is changed.

#1

Hi,
I’m just starting to learn Vray, but I’m having this issues regarding the V-Ray rendering. When I render using centimeter, the rendering is fine like this:

But whenever I changed the scale of the scene from “Centimeter” to “Meter” (Using windows->Prefs-> Settings-> ). The render is all white:

I didn’t resize the any of the objects. The objects were left at the original size. The room height is around 3 meter (300 centimeter).

I’m very curious why Vray did this. What if we need to model the scene using meter as a scale. Will the render behave differently? Or is there any settings that I should change ?

Thank you.

#2

Have tried unchecking or checking “Normalize” in the light attributes?
I don’t remember what is default but maybe try that.
I think you would have to relight the scene because mayaVray was thinking by cm and now you changed it so the lights are too big by the calculations they did already.

#3

Thank you for the reply.
I’m using Vray Sun and Sky to light my scene, but I couldn’t find the “normalize” in the light attribute perhaps you could show me where is located?

Thank you.

#4

Well no normalize…
The intensity seems to be set up for negative exposure.
Other than that I would relight unless photons are way too high.
Should be easy enough to start from scratch.Sorry.

This why with these accurate render engines you have to have accurate models,size etc.
And just changing a size here and there can screw things up.

#5

Try to use the physical camera under the attribute editor, or lower the intensity to something like .001 or so.

#6

Light falloff is based on distance - so if you shrink or grow your set, changing the distance btwn the lights and the objects, then the light values are going to change.

There seems to be this myth going around that since it’s 3D, scale makes 0 difference. It creates a nightmare for dynamics, particles, hair, texturing, shading and lighting, maybe more than that. Seems like animators think this a lot, because their viewport still looks the same at different scales?

#7

you should just scale it up to real world dont need to be perfect but it will help a lot