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    Alpha Channel, Trees, Vray - HELP

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    • C Offline
      CurryPork
      last edited by

      Thanks Thom, I tried right clicking everywhere and cannot find that feature.


      where.jpg

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      • thomthomT Offline
        thomthom
        last edited by

        Sorry. Be in the list of materials. Not in edit mode. (The "Select" tab next to "Edit")

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

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        • C Offline
          CurryPork
          last edited by

          Thanks Thom. I learned something new.

          I got the alpha channel out of the tree now. Do you know how to make it work in Vray?

          I assign a PNG as a bitmap in the COLOR slot in DIFFUSE and the alpha layer as a bitmap in the TRANSPARENCY slot in the DIFFUSE. But when I render in Vray it's not working... any suggestion?

          Thanks

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          • C Offline
            CurryPork
            last edited by

            OK, I got it to work... thanks.

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            • C Offline
              chango70
              last edited by

              So how did you get it to work?

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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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