preserve bump map in vray dirt

[pg1]

we use the extra tex element with a vray dirt material to get an AO pass.
It would be nice if the dirt map would preserve the bump/displacement in the extra texture element pass. This is already possible in brazil and adds a nice subtle depth to the AO would love to see it in v-ray

This was discussed in this thread http://www.chaosgroup.com/forums/vbu...t=43825&page=2
as an option in the override material (Vlado said this is possible) but would probably more useful as a part of the dirt map as it would allow an AO pass with bump detail to be generated in one pass using the extra tex element rather than doing a second render with an override.

[vlado]

Would it be enough to simply make the ExtraTex render element preserve the bump normal when calculating the respective texture (regardless of whether it is VRayDirt or another one)?

Best regards,
Vlado

[pg1]

I attached an images to show what I mean. The original render the current extra tex element and what I want the extra tex to do.
You can do it by turning off all the diffuse maps changing the colour to white and turning off all lights except skylight.This would require a script and a separate render.
Currently it is not possible to do this in one render.





Would it be enough to simply make the ExtraTex render element preserve the bump normal when calculating the respective texture (regardless of whether it is VRayDirt or another one)?

Best regards,
Vlado





If i understand you correctly, that you for example would add a tick box saying preserve bump of material to the extra tex element itself rather than the dirt map, then yes that would be fine

[simmsimaging]

+1 for this - it would be really handy if there was a way the dirt map would preserve the bumps from all scene materials.

b