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    Alpha Channel, Trees, Vray - HELP

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    • C Offline
      CurryPork
      last edited by

      I have it working for the 2D tree and this works for the 3D tree as well. So, just extract the alpha channel from the original texture as Thom described.

      In VRAY, apply the original texture in the Color slot and the alpha in the transparent slot. Render and this solves it.

      Thanks Thom.


      palm.jpg


      coconut_test3_clean_green_alpha.png

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      • C Offline
        chango70
        last edited by

        Thx I just tried it myself and it works.

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        • D Offline
          devran
          last edited by

          Hi Fellowcombatants listen!!! First You download the tree from warehouse... click on the component open it then rightclick and save the png. then open in Photoshop and rightclick on the icon in the layers menu and choose choose pixels... change to channels menu and create a alpha channel... this channel is saveable as a new picture... rightclick on the alpha channel and save as a new picture... thats all.... ( sorry for all non Photoshop users)... ciao devran

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          • T Offline
            tvicari
            last edited by

            You guys rock . . thanks for the tips, works great I have been looking for this solution for a long time. Thanks for making an effort and sharing knowledge.

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            • J Offline
              jdcarling
              last edited by

              Hey all,

              I read this post and have figured out how to create the alpha channel in photoshop for a tree, but cannot find the location to insert the png properly in the material editor - diffuse - transparency. I clicked the lower case, then switched the left panel to TEXBITMAP but coudl not insert the alpha channel PNG anywhere... any tips.

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              • J Offline
                jdcarling
                last edited by

                Hey All,

                I read this post and have figured out how to create the alpha channel in photoshop for a tree, but cannot find the location to insert the png properly in the material editor - diffuse - transparency. I clicked the lower case, then switched the left panel to TEXBITMAP but coudl not insert the alpha channel PNG anywhere... any tips.

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                • thomthomT Offline
                  thomthom
                  last edited by

                  In the Transparency slot of the diffuse layer - add a TexBitmp:
                  vfsualpah.png

                  Thomas Thomassen — SketchUp Monkey & Coding addict
                  List of my plugins and link to the CookieWare fund

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                  • kaluK Offline
                    kalu
                    last edited by

                    Hi thomthom:

                    I have this dilema, I read the post all perfect. I try to mimic the results and I want to know what I am doing wrong. I attach the tree and the images for the render. Please let me know what I am doing wrong. I use Sketchup Pro 8 and Vray 1.48.89. Some of the leaves show as a rectangular green. I have no Idea why.

                    Here is the link to the 3D model of the tree:

                    https://rcpt.yousendit.com/1023169415/e1236da1e739047eed35fa1248da71be

                    Thank you!!!!


                    EU03lef.png


                    EU03lef-Alpha.png


                    tree.jpg


                    tree01.jpg


                    difuse01.jpg


                    difuse02.jpg


                    difuse03.jpg

                    THE ONLY DIFFERENCE BETWEEN FICTION AND REALITY IS WHEN FICTION HAS TO BE CREDIBLE

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                    • thomthomT Offline
                      thomthom
                      last edited by

                      That's because you didn't map the backside of the faces. You can even see that in SketchUp.

                      I'm guessing you imported this from another 3d format?
                      Because of that you lost the backside information. Many other 3d apps doesn't display anything on the backside of faces. You have to explicitly enable it.

                      To quickly transfer UV mapping from one side to another, use this plugin: http://forums.sketchucation.com/viewtopic.php?f=323&t=18992&p=155759#p155759

                      Thomas Thomassen — SketchUp Monkey & Coding addict
                      List of my plugins and link to the CookieWare fund

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                      • kaluK Offline
                        kalu
                        last edited by

                        Thank you ThomThom, aweomse your plugin, I have that problem when Import 3DS trees...

                        This is the result:


                        tree.jpg


                        tree1.jpg

                        THE ONLY DIFFERENCE BETWEEN FICTION AND REALITY IS WHEN FICTION HAS TO BE CREDIBLE

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                        • thomthomT Offline
                          thomthom
                          last edited by

                          👍 Nice

                          Where's that top tree from?

                          Thomas Thomassen — SketchUp Monkey & Coding addict
                          List of my plugins and link to the CookieWare fund

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                          • kaluK Offline
                            kalu
                            last edited by

                            Is from ASGVIS, I need to use for a Tutorial that I work right now.

                            THE ONLY DIFFERENCE BETWEEN FICTION AND REALITY IS WHEN FICTION HAS TO BE CREDIBLE

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                            • T Offline
                              teris
                              last edited by

                              i've tried it... but it didn't work out... i wonder what part i've missed...

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                              • T Offline
                                teris
                                last edited by

                                i've tried it using vray 1.48.xx,,, it works... just use the color texture as transparency option... but when i tried it using vray 6 with the explanation above,,, it still didn't work... i still wonder... help me out guys... thanks...

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                                • bac9-flclB Offline
                                  bac9-flcl
                                  last edited by

                                  Isn't there a way to utilize normal transparency types supported in SketchUp? I'm talking about alpha channels in .png/.tga/etc textures.

                                  I have a vast library of transparent materials, but all of them have transparency data inside, not as a separate file - and it is very inconvenient for me to make separate images with alpha, just to meet weird V-Ray standards. Is it possible (in V-Ray material editor) to assign alpha channel of e.g. RGBA .tga texture to be used as transparency map?

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                                  • andybotA Offline
                                    andybot
                                    last edited by

                                    There is a check box in the material diffuse layer to "use color texture as transparency" for just such files.

                                    http://charlottesvillearchitecturalrendering.com/

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                                    • A Offline
                                      ali64risk
                                      last edited by

                                      @devran said:

                                      rightclick on the alpha channel and save as a new picture... thats all

                                      I tried but I could not...
                                      please someone explain more?
                                      (right clicking on alpha channel in Photoshop gave me 2 options: "duplicate channel" and "save channel"... where I can save alpha channel as png?)

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                                      • N Offline
                                        nomeradona
                                        last edited by

                                        ali.. what they were talking was the workflow for the old version. the new vray version, dont worry, just follow what andybot said.

                                        visit my blog: http://www.nomeradona.blogspot.com

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                                        • A Offline
                                          ali64risk
                                          last edited by

                                          @nomeradona said:

                                          just follow what andybot said.

                                          thank you
                                          yes it is working

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