updating instances and displacement

[G-Vision]

Updating instances problem.

when vray displacement is used on an object (let's say a plane) and it's set to 2d (landscape) ,
when starting to render, the render says it's updating instances, mostly on the last 'modified' object in the scene (this object necessarily doesn't have to be one of the objects with a vray displacement).

the annoying part of this is when you do quick testrender on your scene, this updating is taking up more time then the render itself....

when the displacement is set to 3D en render is hit, it doesn't say anything about updating instances, but then again...why set a vray displacement to 3d when you're working with a plane.

tests are done both with a jpg aswell as a procedural map in the vraydisplacement map slot.

why is this updating of instances which are actually not present in the scene take up so much time?

[instinct]

3d vs. 2D displacement doesnt necessarily correspond to the object it is applied to. rather to the map used and alike. Anyways the reason why it doesnt halt as long is that 3d displacement is presampled per bucket if i recall right. You can check the renderprogress dialogue. It will display "Presampling displacement" quite a lot with 3d displacement. 2D displacement on the other hand is presampled before even starting the render.

Kind Regards,
Thorsten