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[Plugin] GreyscaleMode

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  • S Offline
    sepo
    last edited by 2 Sept 2008, 18:06

    Aha...cheers Dave did not pick that up...Cool. Any chance to actually have more than 10 shades of grey. That would make renders nicer.

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    • D Offline
      Dave R
      last edited by 2 Sept 2008, 18:12

      As I understand it, Jim's method of creating the gray values is to average the RGB values and apply that number to all of the RGB settings. I don't think we're limited to 10 steps as was discussed in the other thread.

      Etaoin Shrdlu

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      • S Offline
        sepo
        last edited by 2 Sept 2008, 18:19

        Actually I think you are correct ... discard the last bit πŸ˜‰

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        • U Offline
          utiler
          last edited by 3 Sept 2008, 00:04

          @unknownuser said:

          I like it and thanks, but can't this be done using a Style?

          I agree, Coen. A face style. That way we could save it to styles and scenes.....

          It wound allow us to 'revert color' in a style / scene though I wouldn't think..... Jim?

          purpose/expression/purpose/....

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          • Z Offline
            zed252000
            last edited by 3 Sept 2008, 03:31

            TY " You're Good !!"

            Whatever we IMAGINE....

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            • J Offline
              Jim
              last edited by 3 Sept 2008, 09:28

              @utiler said:

              @unknownuser said:

              I like it and thanks, but can't this be done using a Style?

              I agree, Coen. A face style. That way we could save it to styles and scenes.....

              It wound allow us to 'revert color' in a style / scene though I wouldn't think..... Jim?

              Thanks and you're welcome, everyone.

              Having it work as a Face Style would be nice. Face Styles can be selected in Ruby by setting an option called the RenderMode. There is just not a way to create a new Face Style that I can see.

              Like Dave said, I don't think a Style is an option either. There is no control over individual colors in a Style.

              The idea of saving material changes between Scenes is a completely separate plugin...

              Hi

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              • U Offline
                utiler
                last edited by 3 Sept 2008, 10:25

                You're right Jim, that's the only thing that restricts it from being a 'face style' option. It would be nice to be able to "update scene" individually rather than a ruby that effects the model period....but that takes away from the "reverse color" option....

                I guess if this was a face style and we wanted to 'spot color' an element, we could set up diferent components and scenes then import into Layout and overlay scenes.....a round about way of doing things though and getting into another topic, 'more than one style in a drawing / file'.

                Five Star, Jim.

                purpose/expression/purpose/....

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                • Z Offline
                  zed252000
                  last edited by 5 Sept 2008, 15:50

                  πŸ‘Š
                  this is just Awesomely Good.
                  Thanks!

                  Whatever we IMAGINE....

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                  • J Offline
                    Jim
                    last edited by 8 Sept 2008, 00:22

                    Hi Guys,

                    A word of caution; utiler has reported he was not able to get the right-click "revert" color option using this plugin. I'm not sure why, but it may mean that the script could "forget" your original material colors. I'm looking into it.

                    EDIT: There is no danger of loosing the original colors. The error was caused because the default color returns nil when asked for its material.

                    Hi

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                    • D Offline
                      Dave R
                      last edited by 8 Sept 2008, 01:05

                      Jim,

                      Thanks for the warning. I haven't seen that problem but I'll keep my eyes open and let you know.

                      Dave

                      Etaoin Shrdlu

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                      • Didier BurD Offline
                        Didier Bur
                        last edited by 8 Sept 2008, 19:12

                        Hi,
                        This happens when the face has default material, here is the error message:
                        Error: #<NoMethodError: undefined method `get_attribute' for nil:NilClass>

                        because in the code, line 16:
                        material = sel.material -> equals nil when no material on face
                        then line 18:
                        rgb = material.get_attribute("GreyScaleColors", 'rgb')
                        get_attribute method can be used on nil πŸ˜‰ and then no context menu.
                        This would be better:

                        
                        if sel.typename == "Face" and sel.material
                            material = sel.material
                            ...
                        

                        @unknownuser said:

                        it may mean that the script could "forget" your original material colors

                        This is impossible IMHO... Attributes on non-geometric objects such as layers and materials, once set, cannot be accessed by the user, lost, erased, or forgotten, unless the script itself does erase them.

                        Last note: I've been told that (red+green+blue)/3 does not give an exact gray value. What Gimp or PS do to desaturate an image for instance is:

                        gray_value=([red,green,blue].max + [red,green,blue].min)/2.0

                        Sketchup::Color.new( gray_value, gray_value, gray_value )

                        My 2 cts (of Euros πŸ˜„ )

                        DB

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                        • J Offline
                          Jim
                          last edited by 8 Sept 2008, 20:44

                          The plugin goes through all in-model materials and changes them to a grey value. The default face color is completely ignored as it does not appear in the in-model materials list, and this is when the material is nil.

                          So the question is, should the plugin also change the default face color to a grey value?

                          Does anyone have a preference for how the greyscale value is calculated? If not, I will try the method suggested by Didier.

                          Thanks, Didier for taking the time to help.

                          Hi

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                          • U Offline
                            utiler
                            last edited by 8 Sept 2008, 22:21

                            I never export images, etc from SU with the default face color. In fact if we did this in grey scale without adding additional color to the scene then grey scale would be a constant....

                            Here is another nice example of grey scale output. [not mine]


                            2045982887_section-aa.jpg

                            purpose/expression/purpose/....

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                            • D Offline
                              Dave R
                              last edited by 8 Sept 2008, 23:27

                              I guess I'm not too picky about how the grays are determined. At this point the average of the RGB values seems to work fine but if there's another option, I'm willing to go that way. As far as the default material being turned to a gray, perhaps it could be left alone? THis would make it easier to identify faces that haven't been given a material.

                              Etaoin Shrdlu

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                              • U Offline
                                utiler
                                last edited by 8 Sept 2008, 23:56

                                True Dave, the default color can go it alone....

                                As for grey scale variation, If we didn't have variation i think it would shade quite bland IMHO...

                                purpose/expression/purpose/....

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                                • D Offline
                                  Dave R
                                  last edited by 9 Sept 2008, 00:02

                                  Andrew, you have a point about the potential for blandness. (I think I just made up a word.)

                                  I'm sure it would add to the complexity of the plugin but suppose one could choose some sort of filter factor. Suppose that you want to simulate a 25 Red filter. You might choose Red from a list of filters which would give green colors lower values (make them darker) while reds would tend to be higher values. This would give you the ability to tune the grays to prevent some colors from being too close together on the gray scale.

                                  Etaoin Shrdlu

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                                  • D Offline
                                    Dave R
                                    last edited by 9 Sept 2008, 01:00

                                    Here's another example of using the Grayscale Plugin. This is raw SU output.

                                    http://img.photobucket.com/albums/v506/weekender410/RBT.jpg

                                    Etaoin Shrdlu

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                                    • U Offline
                                      utiler
                                      last edited by 9 Sept 2008, 01:11

                                      Awesome Dave!!!

                                      purpose/expression/purpose/....

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                                      • D Offline
                                        Dave R
                                        last edited by 9 Sept 2008, 01:17

                                        Thank you Andrew. There's not much color in this model anyway but I like the effect with the grey scale option. I like that the wood grain still shows this way, too.

                                        Etaoin Shrdlu

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                                        • P Offline
                                          plot-paris
                                          last edited by 9 Sept 2008, 06:41

                                          @dave r said:

                                          ...but suppose one could choose some sort of filter factor. Suppose that you want to simulate a 25 Red filter. You might choose Red from a list of filters which would give green colors lower values (make them darker) while reds would tend to be higher values.

                                          do I understand it correctly that with this method you could even create a sepia effect (with some colours standing out of course πŸ˜‰ ). that would be such a cool thing!

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