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    [REQ] Lock texture coordinates

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    • D Offline
      dacad
      last edited by

      In this image you can see what i mean. If i deform a textured fece i want the limits of the texture to remain the same for the face even if it deforms, stretch, or shrink the texture. The only way for this to hapen right now is turning every single face os a mesh into a component and just using with the scale tool (that was what i did for this image).
      If the original texture was projected it will remain projected if i strech the face meaning that the face point will move but the texture position won't.

      Hope i'm making myself clear enough...


      Untitled-5.jpg

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      • GaieusG Offline
        Gaieus
        last edited by

        Yes, definitely the case is that in SU you don't fix the texture to a particular face (series of faces > surface) but to a certain, hidden co-ordinate system let it be the world co-ordinates or something related to the face (group/components it is inside).

        Gai...

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        • D Offline
          dacad
          last edited by

          Thanks for the answer Gaieus.

          A ruby or a sk feature like these is very important because without it we have to texture the mesh everytime we change his form, but if this worked we just have to texture it once and make infinite poses with the mesh while keeping always the same textures position.

          Just for curiosity, no one else thinks this would be usefull or need it for sketchup?

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          • GaieusG Offline
            Gaieus
            last edited by

            Of course I think it would be cool.

            From another point of usage imagine that I texture a cylinder with a certain, carved stone pattern and then I bend it with the new Shape bender plugin and all the textures are "stuck" to the geometry and I have a beautifully textured, ribbed arch for a Romanesque or Gothic church.

            So not only "posing" could benefit from something like this. 😉

            Gai...

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            • D Offline
              dacad
              last edited by

              Completly agree with you Gaieus.

              Because most architectural stuff i've doing is more "cubic" stuff i almost forgot how usefull that could be for more than organic models. But using shape bender, as you said, would have to make a plugin like these compatible with all other modeling plugins, like a plugin working inside other plugin...don't think this is possible or is it?
              Maybe these shoulde be a sketchup 8 request instead of a ruby request...the problem is i really don't believe if it matters or not what we need for them...😞

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              • Chris FullmerC Offline
                Chris Fullmer
                last edited by

                I have no idea if something like this is possible in Ruby. Seems like it could be. I've never looked at textures because I rarely use them. But I do see how it would be nice if it worked the way you described in some instances.

                Chris

                Lately you've been tan, suspicious for the winter.
                All my Plugins I've written

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                • thomthomT Offline
                  thomthom
                  last edited by

                  @chris fullmer said:

                  I have no idea if something like this is possible in Ruby. Seems like it could be. I've never looked at textures because I rarely use them. But I do see how it would be nice if it worked the way you described in some instances.

                  Chris

                  Problem is: observers. In order for this to work you need to detect when the model changes. And that is a can of blood-thirsty angry spaceworms.

                  What I somewhat imagine a ruby would work: the selected face is set to "lock textures". The ruby then samples the UV coordinates from each vertex (or selected points required). When the geometry changes, the ruby would then reapply the texture co-ordinates.
                  Given the headache I've had with observers and UV mapping I'm not sure if I'd touch this with a 10' stick. ...at least not for now...

                  Possible if it'd be acceptable to have a manual function to readjust the textures; might make things easier.

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

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                  • Chris FullmerC Offline
                    Chris Fullmer
                    last edited by

                    That idea of taking all the UV's and then re-applying them - is that fairly stable? I could incorporate it into shape bender, for eaxmple. So it wouldn't fix the problem outside of shape bender, but at least shape bender would be able to do it. AND I wouldn't have to touch any model observers.

                    Chris

                    Lately you've been tan, suspicious for the winter.
                    All my Plugins I've written

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                    • thomthomT Offline
                      thomthom
                      last edited by

                      When you set textures in SU you take a set of 3D points and specify some co-ordiates on the texture that should relate to them.

                      ie.
                      point1 -> 0.0, 0.0
                      point2 -> 0.5, 0.0
                      point3 -> 0.5, 0.5

                      If point 1-3 was points in a rectangle face, then that would map the texture to tile half across the face.

                      So, what I imagine, is that applying the same UV co-ordinates to the same points when the points move, should make the texture 'lock'.

                      However, your Bender widget subdivides the mesh. So you'd have to sample the UV mapping after you subdivide, but before you apply the transformations.

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

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                      • Chris FullmerC Offline
                        Chris Fullmer
                        last edited by

                        Interesting, thats something I'll look into the next release of shape bender.

                        Chris

                        Lately you've been tan, suspicious for the winter.
                        All my Plugins I've written

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                        • GaieusG Offline
                          Gaieus
                          last edited by

                          I'm listening guys, I'm listening... 😳

                          (BTW Thom; this is one aspect I mentioned before)

                          Gai...

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                          • D Offline
                            dacad
                            last edited by

                            Thanks for the explanation thomthom and Chris Fullmer.

                            I was hoping it would be possible but that's too bad...😞. Even if it were updated manually as thom said it would still be great because i think most people would just want the textured model for the final image and not while modeling, posing or whatever, it wouldn't work just for animations.

                            I'm starting to see ruby as a way for sketchup developers don't work to much...

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                            • thomthomT Offline
                              thomthom
                              last edited by

                              I might be possible. It's just not very easy to do. At least not automatically. UV mapping is one of the areas in SU scripting that currently feel like a bit of black magic.

                              @unknownuser said:

                              I'm starting to see ruby as a way for sketchup developers don't work to much...

                              ❓

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

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                              • D Offline
                                dacad
                                last edited by

                                I mean that since ruby was introduced it was at the beggining a great way to add specific functions and automatize some actions, and then turn into part of sketchup develpment itself (every "new" stuff that it's presented it's a ruby plugin like DCs and sandbox, and this brings a dated engine to his knees) and the only hope to solve bugs and limitations of the software (we need a plugin to work as follow me was supost to, or just to draw a basic curve shape...) without google having to do nothing (the users work for advance features and solving bugs in the tools instead of the developers).

                                Keep in mind that we don't have any new modeling tool, animation tool or mapping/texture tool since follow me and sandbox in sketchup 4-5...but i believe that this develpment path was more a marketing decision then a development one, but still a (very) bad marketing decision

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                                • D Offline
                                  dacad
                                  last edited by

                                  But back to topic, maybe the best way for this need is to export the mesh to other 3d package texture it there and import it again to set up the final scene, but the big problem here is that importers have big problems with keeping the textures in place with uvwarping or big meshs...But is there any better way to do this??

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                                  • D Offline
                                    dacad
                                    last edited by

                                    thanks thomthom.
                                    That's what i suspected. with so many software i use to each task, i'm starting to mix up shortcuts keys lolol.

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                                    • thomthomT Offline
                                      thomthom
                                      last edited by

                                      A different application might be the way to go at the moment. SU isn't very ideal for rigging. And I'm a believer of using the right tool for the right job. I think that SU might not be the right tool for this.

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

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                                      • W Offline
                                        Whaat
                                        last edited by

                                        Here are some methods to load and save UV sets. If someone wants to use them to create a 'lock texture' plugin, that's fine with me. 😄

                                        def store_uvs(ents,uvset)
                                        
                                        face=0
                                        case uvset
                                        	when 0
                                        		key="uv0"
                                        	when 1
                                        		key="uv1"
                                        	when 2
                                        		key="uv2"
                                        	when 3
                                        		key="uv3"
                                        end
                                        
                                        Sketchup.active_model.start_operation "Save UV set"
                                        
                                        for e in ents
                                        	
                                        	if (e.valid?) and (e.class==Sketchup;;Face)
                                        		
                                        		polymesh=e.mesh 5
                                        		uvs=polymesh.uvs 5
                                        		for i in (0..uvs.length-1)
                                        			uvs[i]=uvs[i].to_a  #converts the Point 3D objects to arrays so they won't be transformed
                                        		end
                                        		e.set_attribute 'uvs',key,uvs
                                        	
                                        	face=face+1
                                        	Sketchup.set_status_text("Stored uvs for #{face} faces.")
                                        	end
                                        		
                                        end
                                        
                                        UI.messagebox "UVs saved for #{face} faces."
                                        
                                        Sketchup.active_model.commit_operation
                                        
                                        end #function
                                        
                                        ###################position a texture on a material from a stored UV set
                                        def position_map(entities,set)
                                        
                                        face=0
                                        failed=0
                                        return if set=="SU"  
                                        key="uv"+set.to_s
                                        p "positioning map"
                                        p entities
                                        for e in entities
                                        	p e
                                        	if (e.valid?) and (e.class==Sketchup;;Face)
                                        		
                                        		uvs=e.get_attribute 'uvs',key    #gets the stored array of uv coordinates for this face for the given uv set
                                        		p uvs
                                        		if uvs
                                        			pos=[]
                                        			polymesh=e.mesh 5   #get a polygon mesh representation of the face
                                        			polygons=polymesh.polygons  
                                        			poly_index=0
                                        			begin
                                        				for p in polygons[poly_index]
                                        					point=polymesh.point_at(p.abs)
                                        					if point
                                        						pos.push(point) 
                                        						pos.push(uvs[p.abs-1])
                                        					end
                                        				end
                                        
                                        				e.position_material e.material, pos, true
                                        				face=face+1
                                        				Sketchup.set_status_text("Loaded uvs for #{face} faces")
                                        			rescue  #this is required because SketchUp sometimes fails to position the texture properly
                                        				poly_index=poly_index+1
                                        				if polygons[poly_index]
                                        					pos=[]
                                        					retry  #try to postion texture again using next polygon in the face
                                        				else
                                        					failed=failed+1
                                        				end
                                        			end
                                        	
                                        			
                                        		end
                                        	end
                                        end
                                        
                                        if failed>0
                                        	stext="Unable to load
                                        	UVs for #{failed} faces.  Loaded UVs for #{face} faces."
                                        else
                                        	stext="Loaded UVs for #{face} faces."
                                        end
                                        
                                        #UI.messagebox (stext)
                                        
                                        
                                        end  #end position map
                                        

                                        SketchUp Plugins for Professionals

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                                        • D Offline
                                          dacad
                                          last edited by

                                          WOW, thanks Whaat. Has always you're great!:)
                                          My knowledge in ruby is very limited so can anyone help with this? (or change the name of this topic to "[Request]Lock texture coordinates")
                                          Thanks in advance

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                                          • R Offline
                                            remus
                                            last edited by

                                            Unfortunately it isnt quite as easy as that. Ruby has it's own separate commands that dont necessarily match those that you see in the SU UI.

                                            I suppose you could think of it as ruby seeing a different UI to what the user sees: sometimes the stuff we see matches up with what ruby sees, sometimes ruby sees extra stuff we dont see and sometimes we see stuff ruby doesnt see.

                                            http://remusrendering.wordpress.com/

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