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Vray for Maya Normal Map Problem

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  • Vray for Maya Normal Map Problem

    Hi All,

    I've downloaded the trial for v-ray for Maya.
    I'm am aware I'm posting in the wrong section of the forum. But I don't seem to have to rights to post in the Maya section. I didn't get a response from the support email.

    So here it goes :

    I'm experiencing the following problem with VRay for Maya.


    Looks to me like tangent mismatch between viewport 2.0 and VRay.

    I'm rendering in Maya 2017. I'm using VRay version 3.52.03
    The Normals on the mesh are completely soft and "unweighted".

    Can anybody tell me of a workaround or checkbox to get this fixed without changing my content ?
    For example in Mental Ray there is a option called export Maya Derivatives, that matches the renderers tangents to that of Maya.
    As extra information I've uploaded a stripped down version of the test-scene.

    test Scene

    I've also experimented with triangulated vs quads. And made sure the map is set to "Raw" colour space.
    I'm trying to figure out how to get the normal map consistent.
    Viewport 2.0, High Quality Viewport and Mental Ray are all consistent.
    VRay and Arnold are giving me different ( vissually wrong ) results.

    In the past I also noticed Maya Viewport Normal Maps aren't in sync with Mudbox Viewport Normal Maps.




    I did render those normal maps without triangulating.
    Because you don't have VRay I made a quick render of my test scene, viewport 2.0 versus zbrush IPR


    The triangulation has a lot effect but as you can see from the lower left one there are still some artifacts that look to be unrelated to the triangulation. It also looks like Vray respects "locked normals"

    But as you can see from the previous image on the circular element there is another mismatch that is not explained by triangulation. Maybe tangent space is MikkTspace for one, and something else for the other one.

  • #2
    Hi ArnoZ and Happy new year!

    I'm getting the same difference in the bump in my tests here but I'm not able to tell you if this is an expected behavior or some changes in the code are required. Let me discuss the case with our developers first and will provide more precise answer about this issue.

    In regards to the forum posting rights, do you have any Ticket/Case number with the initial support request ? We need the name which is used to login to our website to find your account and associate it to your forum nick name. You can send another request to support@chaosgroup.com with these details if needed.
    Tashko Zashev | chaos.com
    Chaos Support Representative | contact us

    Comment


    • #3
      Hi Tashko,

      I'll resend an email to support@chaosgroup.com I don't have ticket yet.
      Hopefully we can get this sorted. I have a whole character ready for render. But it's riddled with these errors. Because I checked and approved all my normal maps in the viewport 2.0 They All looked good there.


      EDIT :

      I've got my ticket number : 084-766-104

      Happy new year to you too !

      Cheers,

      Anro
      Last edited by ArnoZ; 02-01-2018, 06:19 AM.

      Comment


      • #4
        Thank you Arno, your forum account is now updated. Just log-out/ log-in to take the new privileges.
        As for the normal map issue, we need to investigate this further and see which methods is most accurate. Additional options would be to implement similar option like Mental Ray to equalize both results, but this depends on the devs research.

        I will post here as soon as we have any news to share.
        Tashko Zashev | chaos.com
        Chaos Support Representative | contact us

        Comment


        • #5
          Thanks Tashko,

          I'm looking forward to your response. My project is depending on this being fixed :P

          Cheers,

          Arno

          Comment


          • #6
            Hi Tashko,

            It's been week without any reply from support@chaosgroup.com .
            The automatic email said they would get back to me in a couple of days.

            Could you give me an ETA on a reply ?
            My ticket number is 084-766-104

            Cheers,

            Arno

            Comment


            • #7
              Hey Arno,

              I just decided to reply directly here instead of using the mail - Post #4. The issue is in our bug tracker and when we have any update on it will post here or contact you via the same ticket number. Unfortunately we don't have this fixed yet but I can raise the priority a bit.
              Tashko Zashev | chaos.com
              Chaos Support Representative | contact us

              Comment


              • #8
                Thanks Tashko,

                That would be much appreciated, at the moment this issue is a show stopper for my project!

                If you need any additional information, or test geometry feel free to contact me any time.

                Cheers,

                Arno

                Comment


                • #9
                  Hi Tashko,

                  Any update on the status of this issue ?
                  This project can't progress as long as this issue persists.

                  Feel free to contact me if you need any additional information or test geometry.

                  Cheers,

                  Arno

                  Comment


                  • #10
                    Not yet unfortunately. We won't forget to inform you when the fix is out.
                    Tashko Zashev | chaos.com
                    Chaos Support Representative | contact us

                    Comment

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