[Req] Texture Corrector.... PLEASE

thomthom

SketchUp does some weird stuff when it comes to backfaces. If you have a face where you apply a transparent texture on the front it automatically mirrors on the back if the backface has the default material. If you stretch and distort the texture on the front it updates the back. But if you apply a backface material, and you break that link. After removing the backface material to default, SU doesn't reset the mapping co-ordinates. Not until you make a change to the front side again, then it synchronizes again.

So maybe an alternate method would be for the script to reset the backface material to default and "touch" the front material forcing SU to update the backface.

silver_shadow

I would also see this rubie happen. A lot of times i get a tree fro mxfrog and the textures of the face is correct on the one side but all messed up on the other side. It makes it difficult to present to clients if you dont want to render it (because rendering fix the problem) and present it in raw sketchup.

free agent

is this a difficult script to write???

free agent

seriously NOTHING????!!!!!

tomasz

Hi,
It can be done for a flat object as a leave. I will have to do this exercise for FrontFace ruby, so will try to cook something simultaneously.
Tomasz

thomthom

Excellent!

40Th

@rickw said:

With one or more faces selected, try this in the ruby console:

Sketchup.active_model.selection.each{|e| e.back_material=e.material if e.typename=="Face"}

I suggest you start with 1 or 2 faces to see if it works as expected, since I don't have one of your models to test. If that works for you, let me know and I'll "put some skin on the bones".

How do i use this script? And does this script solves this issue?

RickW

Unfortunately, it doesn't solve the problem. There's a lot more complexity to it than I first thought. That's why there isn't a solution posted yet...

davide.skp

Rick, this is essential plugin!!!
because every 3d trees sw produce geometry like free agent say...

thomthom

Any news on this?

Will pay money for it.

free agent

bump...

thomthom

I tried having a go at this myself. But I can't work out how the API's related to textures work. I'm thinking this isn't the best challenge for a first ruby...

BillW

I dont know if this is of any use - a ruby I call via the ruby console with load "<filename>"
after selecting the faces I want to work on.

What it does is set the front face (of selected faces) to have the same material and texture mapping as the back face. It worked for me with a particular problem I had in which an imported image I exploded and did a pushpull - the top face didnt show the texture map - it was on the other side ie back face.
Reapplying the material didn't do the trick as the image had been scaled on import. For your situation
the code will need to changed ie

get_back_UVQ to get_front_UVQ
ent.material = ent.back_material to ent.back_material = ent.material


model = Sketchup.active_model
tw = Sketchup.create_texture_writer
    
model.selection.each { | ent | 
  case ent.typename
    when "Face" then

# sets front material and mapping as back material

     ent.material = ent.back_material
      uvHelp = ent.get_UVHelper(true, true, tw)

      pt_array = []
      
      numint = (ent.outer_loop.vertices.length / 4).floor

      vert = ent.outer_loop.vertices[numint-1]
      uvq = uvHelp.get_back_UVQ(vert.position)
      pt_array.push(vert.position,uvq)

      vert = ent.outer_loop.vertices[(numint*2) - 1]
      uvq = uvHelp.get_back_UVQ(vert.position)
      pt_array.push(vert.position,uvq)

      vert = ent.outer_loop.vertices[(numint*3) - 1]
      uvq = uvHelp.get_back_UVQ(vert.position)
      pt_array.push(vert.position,uvq)

      vert = ent.outer_loop.vertices[(numint*4) - 1]
      uvq = uvHelp.get_back_UVQ(vert.position)
      pt_array.push(vert.position,uvq)
		  
     ent.position_material ent.material,  pt_array , true # Set front coords

  end
}

thomthom

!!! Bill!
That's excellent!

That's just what I needed. Do you mind if I publish a ruby with your code in it? There's a bunch of V-Ray users that sorely need this in order to be able to use X-Frog trees for rendering vegetation in models.

EarthMover

Thomas,

Have you tested this code out? Does it work? (fingers crossed.....)

thomthom

Yes! I've tested it out after tweaking it to copy from front face to back face. Just got to make it work on nested groups/components and add menu item and we're gold.

BillW

Thomthom

Feel free to parcel up the code.

Regards

Bill Wood

thomthom

Complete Ruby here: http://www.sketchucation.com/forums/scf/viewtopic.php?f=180&t=14684

So, from what I understand of the plugin, it takes the real world co-ordinates of four point and their UV mapping, which then is transferred directly to the other side? And it doesn't require the face to have four vertices because you sample four points out of the total points and that's enough to place the texture correct?

It looks much more simple now that I see the working code. But I couldn't make any sense out of the data I got from the UVHelper object.

BillW

So, from what I understand of the plugin, it takes the real world co-ordinates of four point and their >>UV mapping, which then is transferred directly to the other side? And it doesn't require the face to >>have four vertices because you sample four points out of the total points and that's enough to place >>the texture correct?

Exactly how it works. However, I think it may fail with a face of only 3 vertices though. I didint check the UVHelper data - it just worked.

Bill Wood

thomthom

Yea. I didn't test it myself. Thought of it when I made the post. Might have to test that out and make some modification for triangle faces.

Once again Bill, thank you very much. I have 5 DVD sets of XFrog trees which was of no good due to the messed up backfaces.