Ornatrix 3dsmax: Pref passe and ornatrix

Hello, I have some characters with ornatrix groom to render and I would like to have a Pref passe (like this http://erwanleroy.com/create-position-reference-pref-pass-in-vray-for-maya/) and get more control in compositing. I tried to do it with an uvw map (xyz to uvw) on top of each geo and get it into a vertex color node in a VrayExtraTex, it was ok except for the groom that appeared totally black. How can I have my groom in my Pref without convert it into a mesh ? I'm working on 3dsmax 2018 with Vray 3.60 and ornatrix 6.0.20. Thanks, Ulysse
21 January 2019 #22733
EPHERE	Yes, this is possible. We'll need to make a tutorial explaining this. The basic idea is to use GenerateGuideData modifier with Object Space being exported to a texture channel, which is then rendered using the Vertex Colors texture in 3dsmax. Marsel Khadiyev (Software Developer, EPHERE Inc.)
21 January 2019 #22737
UlysseA	Hey, thanks for reply ! I'm sorry, but I must forget something about export Object Space to a texture channel.. (the texture coordinates mode is indicated as currently unsupported in the doc?) I tried to load the Object Space Positions in the Texture Coordinates with the same channel as my geo but the fur still render black. (tested with a different channel and same result) Ulysse Attached Files: issuePref.PNG (428880 bytes),
21 January 2019 #22739
EPHERE	Try changing the channel to per-vertex, and also the mapping channel to 4 in one place and 5 in another. Marsel Khadiyev (Software Developer, EPHERE Inc.)
21 January 2019 #22740
EPHERE	Try changing the channel to per-vertex, and also the mapping channel to 4 in one place and 5 in another. Marsel Khadiyev (Software Developer, EPHERE Inc.)
21 January 2019 #22742
UlysseA	Thanks again, I tried, but no change ! Ulysse
22 January 2019 #22751
EPHERE	Please see if these steps match: https://ephere.com/plugins/autodesk/max/ornatrix/docs/6/Position_Reference_Pass.html Marsel Khadiyev (Software Developer, EPHERE Inc.)
22 January 2019 #22753
UlysseA	Hello, thanks for the tuto ! Finally, I have the result I want ! I followed all steps but when I changed channel map to more than 2 (I would like 5), Vray send me an error and stop render. If I set channel 1, I just have a uv pass on render (even if I set channel 1 in the vertex color node, and same thing if I set channel 2). The only time I had a good Pref was when I set channel map to 0. About the vray issue, if I move the Generate Guide Data modifier under the Hair from Guide it's rendering ! But same as start, the fur is totally black. Is Ornatrix only override channel map 0 ? I joined some of the results I had and the Vray error ! Thanks, Ulysse Attached Files: Vray_error.PNG (14832 bytes),
22 January 2019 #22756
EPHERE	Yes I noticed the same thing with channels. I need to do some more testing. Marsel Khadiyev (Software Developer, EPHERE Inc.)