ZBrushCentral

Help with my polypaint to texture map resolution issue...

ZBrush Usage Questions
#1

Hi,
So I have models that I’m happy with of sinus and nasal anatomy. I’m polypainting them to look realistic based on endoscopic videos and photos…

My problem is that I can get it to look good from a distance and minor close up, for example the ethmoid sinus model is at div level 5 and has about 15 million polys and I export a 4096 bitmap… but on the virtual tours, both the texture maps and the normal maps… or ive tried displacement and vector maps… when you get very close close ups, they aren’t at high enough resolution.

How do people deal with this? Would you make one map/model combo for more distant view and then make a smaller more focused part of the model as a different subtool/map just that portion that is viewed in closeup, and somehow switch/fade that over in (3ds Max for me) as you pan closer? Maybe avoid pans and just change view with discreet camera view changes.

I tried messing with HD Geometry and tried subdividing more and making a bigger texture map, but that seems to get unweildly despite 64 bit zbrush and plenty of memory and such.

How is this usually dealt with?

Thanks guys…

#2

What do your UVs look like? It could just be that the areas that you need a lot of resolution on, aren’t given enough texture space.

#3

I have tried, using UV master, to paint like 4x in some areas that I’m zooming in on. Ive tried to use bigger alphas to put details, such as small blood vessels/capillaries - they seem limited by the polygon count in the area as expected regardless if I hand paint, spotlight with big maps, or use alphas that have both zadd/and Rgb - capillaries are the main fine detail Im using to make closeups realistic and provide orientation to the viewer…

I think Im just trying to get too much out of one model/texture map in that I’m showing it both at a distance and very close up, and then viewing it stereoscopic makes details easier to see any pixilation and disparity between the polypainting and the normal maps…

thanks, I have experimented with that

#4

Have you checked that the exported texture map really is 4096? ZBrush won’t export the maps any larger than the size of the UV map. So if your UV is only 1024 and you tick 4096 for your exported texture map, it will export at 1024 and you won’t know it until you actually check the size.