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Poser F.A.Q (Updated: 2016 Nov 29 4:50 pm)
Subject: Car paint - a challenge
After I have fooled around with it in the material room and I did not get anywhere close to it, I am asking for help or ideas. Can something like this be done in the Poser material room? (see link) Car paint is difficult - ral car paint not just a color with glossines and reflection. Thre seem to be two approachers in the literature on the net. One is modelling a two layer paint and the other can be seen at the link. Thanx in advance for hints.
The first one ceratinly is possible, I can post an example later today. I can't say much about the second one yet, as I'm not very fluent in XSI, and it looks like the screentshots document only parts of it. I'm not sure if XSI EXP will load the shader that's posted. Anyone wanna give me $499 for XSI Foundation? (You will get a P5 car paint shader in return)
Quick gamma adjustment in Photoshop for a brigher look on this Windows computer (may be washed out if you're on a Mac). Note that the car image above had a white plane above it, like in the Maya tutorial (very popular trick for car images). This image has a HDRI environment map (real HDRI, that is - stay tuned for some material room magic ;)
Now how to have HDRI maps in P5: The trick is to decompose it to LDRI maps in HDRShop and recombine them in the material room. In this case, I exported to 8bit TIFF files from HDRShop, one at an exposure of +2 apertures, one at -6 apertures. The multiplication factor of 2^8 = 256 (8 aperture steps difference) brings the maps back to their original brightness.
stewer, would you apply that to a sphere that encloses the scene, and if so would you still need to use lights (which hdri images normally produce)? The HDRI map here is used for reflection, not illumination. It's a popular confusion, 99% of the time when someone says "HDRI" he/she really means image based lighting. Not here - here HDRI is just that - a high dynamic range image. So, you use this just like you would use a reglar environment map.
Right, I see. Is it that HDRI set-up that is connected to the reflect node in your paint shader material, or is that just a regular environment map connected?
Sorry for all the questions, but inquiring minds want to know! :) Cheers. It seems you answered while I was writing! :) Very good effect indeed.
Message edited on: 01/11/2005 16:19
I saw someone asking how to make a car shiney the other day, maybe this thread will help.
"It is good to see ourselves as
others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi