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  1. #1
    CG Cars Junior Member
    Aviator's Avatar
    Autodesk 3D Studio Max Autodesk 3D Studio Max Chaosgroup V-Ray
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    Vray Aircraft Paint material using Shellac and UVW map

    Hey everyone, first post here. Lots of great work and artists in the community.

    I'm working on a project for an aviation company which involves modelling, texturing and rendering a EC145 helicopter in 3ds max and vray HDRI with GI.

    I am trying to use a Shellac material for the paint however the UVW map texture underneath gets washed out by the "clear coat" overtop.

    Attached is an example of the aircraft, as you can see the 2 side doors we put a completely different material than the shellac material, just so you can see the comparison and how much the clear coat is washing out the blue base material on the body. Currently there is a base material (Blend) with a Shellac Material under that (VrayMtl).

    Has anyone come across this before? Perhaps I should be putting the psd uvw texture into the Opacity channel and NOT the diffuse of the Base Material?

    Any help would be appreciated!

    Cheers,
    Ryan




  2. #2
    CG Cars Member
    EquiNOX's Avatar
    Autodesk 3D Studio Max Rhinoceros Chaosgroup V-Ray
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    I can't really answer your question on why you re getting washed out.. unless you wish to expand what you have in material setting i.e. uvmap and so on.... Yet, I would suggest you to use VRayBlendmat instead shellac, It's much faster, better control and less confusion.

    Tips for VRayBlend Material: Place VRayMat in base, inside the "Base" place the UVMap in diffuse slot of VRaymat... Place another VRay inside coating slot, and so on ... Hope that helps

    By the way, its a nice helicopter.
    Finished Work - Aston Martn DBS


  3. #3
    CG Cars Junior Member
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    Thanks for the tip EquiNOX, VrayBlend Material is definately the best choice... see the attached. With some tweaking of the coat reflection it should work out good.

    Now onto the glass. As you can see the door glass panels are pretty much invisible at the moment. I cant seem to get a reflection in these unless i increase the IOR of the refraction. But then that much refraction distorts all the details in the cockpit.

    Thanks again for your help!




  4. #4
    CG Cars Junior Member
    КiRО's Avatar
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    For the glass use Frsnel reflections with reflection color set to white (255;255;255) and make the glass a little more transperant, now it looks too grey
    >>kirographics <<
    tutorial-z.com


  5. #5
    CG Cars Junior Member
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    Kiro, ya I tried fresnel reflections, problem is fresnel only works good when you have a high refraction IOR... and when theres a refraction higher than 1.0 it distorts the cockpit as seen in the attached. I basically want minimal amount of refraction so you can still see the details in the cockpit/cabin without them looking distorted, but there needs to be a reflection so the glass is apparent - this i cant seem to get in the glass without a higher refraction IOR.

    [/IMG]


  6. #6
    CG Cars Junior Member
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    to fix this problem add a shellac modifier to the glass planes so it works like in real life, I mean glass has thickness
    The mat for the attached image is:
    Diffuse color: black
    Reflection Color: white with frsnel checked
    Refraction color: Almost white; Index of Refraction : 1,517
    Hope that helps
    P.S. And if you still want stronger reflections change the value of the Index Of Reflection to smth like 2 or what ever you like
    Attached Images
    Last edited by КiRО; 08-10-2011 at 09:51 AM.
    >>kirographics <<
    tutorial-z.com


  7. #7
    CG Cars Member
    EquiNOX's Avatar
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    ....or add a Fresnel map inside the reflection slot. Inside frensel -- perspective with Top Grey approx 235 bottom 155.... Or adjust however you like. It'd just balance out the reflection level on glass itself.
    Finished Work - Aston Martn DBS


  8. #8
    CG Cars Member
    kriscabrera's Avatar
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    i think some exterior renders will help you alot in figuring out whats going wrong
    CG, Artist, i like to call them GOD.
    My Portfolio


  9. #9
    CG Cars Junior Member
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    i like but (*off topic* how did you score that job???) ok and it kinda looks like the dash is coming through the glass
    j2
    ----
    wip(s)
    Koenigsegg CCX(R)


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