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Displacement doesn't work on imported plane but does work on daz primitive plane

FalcoFalco Posts: 249
in Technical Help (nuts n bolts)

Like the title says, I added displacement mapping to a daz primitive plane and it looks as it should when rendered in IRAY. However if I import an obj model of a plane and add the same material to it, displacement mapping seems to not work on it.  I haven't been able to get displacement working on any imported obj model no matter the resolution/topogoly/displacement settings.  Is there something I need to do to to allow imported meshes to work with displacement?

Comments

  • SimonJMSimonJM Posts: 6,067

    What does a comparison between mesh density of the planes give?  Iray can oly displace on gemoetry whilst 3Delight can use micro-dsiplacement.  I'd guess your imported plane is very low on ploygons, so displacment is not being that effective.  Youmay get somewheer if you SubD the plane.

  • Richard HaseltineRichard Haseltine Posts: 108,063

    Is the imported mesh UV mapped?

  • FalcoFalco Posts: 249
    edited March 2018

    Yes the imported meshes are uv mapped.  The daz primitive plan is only 2 triangles, but still subdivides fine when displaced. I've added lots of subdivisions to the imported meshes in max before exporting and also tried converting them to sub d in daz and adding subdivisions that way.  It doesn't seem to be a resolution issue, the displacement just seems to be disabled for some reason.  

    Here is an image, the left plane is the imported one, the right is the daz primitive.  The imported one has 5k tris and both are set to 12 displacement subdivisions and identical materials. I also tried lowering the subdivisions in case it was getting too dense for some reason.  

     

    Post edited by Falco on
  • Richard HaseltineRichard Haseltine Posts: 108,063

    Could you upload or link the mesh from Max?

  • FalcoFalco Posts: 249

    File is attached, thanks.

    zip
    zip
    plane.zip
    48K
  • Richard HaseltineRichard Haseltine Posts: 108,063

    That works for me, both in Iray and 3Delight, with a random displacement map applied

    Plane Iray displacement.jpg
    1000 x 1000 - 746K
    Plane 3Delight displacement.jpg
    1000 x 1000 - 296K
  • FalcoFalco Posts: 249
    edited March 2018

    It turned out that due to the daz issue of importing objs from max with normal reversed, i had to flip the plane upside down in order to see the normals.  Even though it renders both sides, displacement only works on the side with the normal facing out. 

    Thanks for checking the mesh for me, it helped to narrow down what was wrong. 

    Post edited by Falco on
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