8 Replies Latest reply on Aug 30, 2010 6:20 AM by Modus21

    Render does not match preview

    Modus21 Level 1

      OK, so I have a pretty cool effect using Photoshop in AE for a 3D object. I'd love to explain what I did, but it was a long process and I'm sure seasoned AE users can see how it was done. Basically I'm having a solid 3D textured object wiping on top of its own wireframe. In the preview screen, the effect looks fabulous. This is what I see on my preview:

       

      http://i695.photobucket.com/albums/vv313/Bubble_Bobble_Bibble_Babble/Dwm2010-08-2912-23-42 -83.jpg

       


      However, rendering the first couple seconds, gives me this:

       

      http://i695.photobucket.com/albums/vv313/Bubble_Bobble_Bibble_Babble/Dwm2010-08-2912-27-10 -04.jpg

       

      You can see the bottom portion is staying wireframed and I just can't figure out why. Anyone have a solution?

       

      Thanks for any help.

        • 1. Re: Render does not match preview
          Todd_Kopriva Level 8

          The images look the same to me, but there's a lot going on there, so I may have missed something. If they don't look the same to you, please give us something more focused and narrow to look at that shows the problem.

           

          BTW, you're not rendering with OpenGL, are you? If so, don't.

          • 2. Re: Render does not match preview
            Modus21 Level 1

            I circled the problem in this pic:

             

            http://i695.photobucket.com/albums/vv313/Bubble_Bobble_Bibble_Babble/problem.jpg

             

            You can see that in the other picture those spots are covered with textures.

             

             

            I'm probably rendering with OpenGL.. how do I disable it for exporting? It's enabled for previewing, but I don't see an option for exports. Disabling it in previews seems to have no effect on the previews.

            • 3. Re: Render does not match preview
              Todd_Kopriva Level 8

              > how do I disable it for exporting?

               

               

              See this page.

              1 person found this helpful
              • 4. Re: Render does not match preview
                Modus21 Level 1

                OK, I have not been rendering with OpenGL so that's not the problem.

                • 5. Re: Render does not match preview
                  Mylenium Most Valuable Participant

                  I see nothing wrong there. In preview mode, PS 3D layers use no antialaiasing, which may suppress some lines from actually producing any visible pixels. When rendering for final output, quality is set to best, which may make those missing lines reappear and PS 3D's antialiasing being quite rubbish, it looks like the areas are filled. There's really no good way to avoid or circumvent it. however, you may get into reading up on how multipass rendering using material/surface/object IDs works in 3D programs and adapt the technique by using a duplicate of your 3D model set to "Unlit Texture" and derive masks for the regions. Articles is here.

                   

                  Mylenium

                  1 person found this helpful
                  • 6. Re: Render does not match preview
                    Modus21 Level 1

                    What's a good starting point to learn 3D? What program should I start figuring out first? I think I' might be in over my head on this project.

                    • 7. Re: Render does not match preview
                      Mylenium Most Valuable Participant

                      There's no need to learn a 3D program to do any of that, but of course you can always try Blender, which is free, after all. For your specific project I was thinking that you might

                       

                      • save a duplicate PSD
                      • replace the diffuse textures (bricks etc.) with solid, pure colors
                      • set the rendering mode of this to "Unlit Texture"
                      • import into AE
                      • link the camera of the resulting comp to the original comp
                      • use the techniques in the article to derive region mattes by using the second comp as a 2D layer in your otehr comp
                      • use the mattes as adjustment layers to control the aspects of the look of your scene

                       

                      When doing so, you could e.g. apply a Matte Choker or Minimax effect to control the thickness of the wireframe lines in relation to the colored fills. The more you separate the workflow, i.e. also create the wireframe as a separate layer, the more you can control all aspects.

                       

                      Mylenium

                      • 8. Re: Render does not match preview
                        Modus21 Level 1

                        OK, this makes a lot more sense now after you de-lingo'd the article a bit. Pretty sure I'm getting the 2D layer matte concept, but I haven't finalized the camera keyframing so I can't do that until I'm 100% sure the movements are perfect. The other issue is that I already have a comp inside this comp with another copy of the 3D object, along with color corrections, glow, a moving ramp layer used as a stenciled alpha.. the list goes on. Even at one-third resolution, my PC is at its knees and exporting what I have now already takes 10 hours.

                         

                        If anyone wants to donate a Mac Pro 8-core, get a hold of me Until that happens, I'm looking at massive amounts of time into a 15-second comp. That's just the nature of the beast, I suppose.

                         

                        Thanks for your help, guys. I'll try the mattes if the problem persists.