Apply images to terrain using ruby code

sonjachr · 13 Jul 2015, 09:43

I found the following instruction in SU documentation:

Apply images to terrain models:

Import an image as an object by going to file > import and leave the "use as texture" box unchecked.

Scale and position the image over the site plan so it is properly aligned. Right click on the image and choose Explode. Using the Paint Bucket, Alt-click on the image to pick up the material, then click on any part of the terrain to project the image down onto the terrain surface.

I almost managed to code it in ruby, but I am stuck when it comes to the Alt-click.
My question: how can I send the Alt-click using ruby or how can I sample the image using ruby

Help is very much appreciated

sdmitch · 13 Jul 2015, 20:07

@sonjachr said:

I found the following instruction in SU documentation:

Apply images to terrain models:

Import an image as an object by going to file > import and leave the "use as texture" box unchecked.

Scale and position the image over the site plan so it is properly aligned. Right click on the image and choose Explode. Using the Paint Bucket, Alt-click on the image to pick up the material, then click on any part of the terrain to project the image down onto the terrain surface.

I almost managed to code it in ruby, but I am stuck when it comes to the Alt-click.
My question: how can I send the Alt-click using ruby or how can I sample the image using ruby

Help is very much appreciated

Scaling and positioning the image over the site plan isn't really necessary. When you explode the Image, a single face is created in the model with the Image as the applied material. The following code produced the results shown in the gif.

mod = Sketchup.active_model
ent = mod.active_entities
sel = mod.selection
img = ent.grep(Sketchup;;Image)[0]
grp = ent.grep(Sketchup;;Group)[0]
old = ent.grep(Sketchup;;Face)
img.explode
new = (ent.grep(Sketchup;;Face) - old)[0]
mat = new.material;xdel=grp.bounds.width;ydel=grp.bounds.height
grp.entities.grep(Sketchup;;Face).each{|f|
 mp = []
 f.outer_loop.vertices.each{|v|
  p = v.position
  u = p.x/xdel
  v = p.y/ydel
  mp<<p<<[u,v,1.0]
 }
 f.position_material(mat,mp,true)
}

sonjachr · 14 Jul 2015, 09:22

Thanks a lot for the quick response.

Your code is working perfectly.

However I've got a further problem and thus a new question. I am sure it is easy for you, but it is hard for me to get the right solution. I searched a lot in the Forum but did not find an answer to my problem.

When I load the below image and run your code to apply the image to the terrain I get what you see in the second image.

Using a different image works fine, so I guess my image export was not done correctly.
Do you have any ideas?

Many Thanks in advance

sdmitch · 14 Jul 2015, 13:35

@sonjachr said:

Thanks a lot for the quick response.

Your code is working perfectly.

However I've got a further problem and thus a new question. I am sure it is easy for you, but it is hard for me to get the right solution. I searched a lot in the Forum but did not find an answer to my problem.

When I load the below image and run your code to apply the image to the terrain I get what you see in the second image.
[attachment=1:2vgsbols]Mer_Bie_01_new.png[/attachment:2vgsbols][attachment=0:2vgsbols]Mer_Bie_01_proj.png[/attachment:2vgsbols]

Using a different image works fine, so I guess my image export was not done correctly.
Do you have any ideas?

Many Thanks in advance

My code assumed that the origin of the terrain group was 0,0. It would appear yours is not and that will cause the shift.

Perhaps this modified code will solve that problem.

mod = Sketchup.active_model
ent = mod.active_entities
sel = mod.selection
img = ent.grep(Sketchup;;Image)[0]
grp = ent.grep(Sketchup;;Group)[0]; gt = grp.transformation
old = ent.grep(Sketchup;;Face)
img.explode
new = (ent.grep(Sketchup;;Face) - old)[0]
mat = new.material; grp.transform! gt.inverse
xdel=grp.bounds.width;ydel=grp.bounds.height
xmin=grp.bounds.min.x;ymin=grp.bounds.min.y
grp.entities.grep(Sketchup;;Face).each{|f|
 mp = []
 f.outer_loop.vertices.each{|v|
  p = v.position
  u = (p.x-xmin)/xdel
  v = (p.y-ymin)/ydel
  mp<<p<<[u,v,1.0]
 }
 f.position_material(mat,mp,true)
}
grp.transform! gt

sonjachr · 14 Jul 2015, 14:01

Many Thanks,
this works, I really appreciate your help!
I feel ashamed as I should have found the solution by myself. I will try to work harder on my Sketchup/Ruby knowledge, but I will never become an expert as you are.

sdmitch · 14 Jul 2015, 15:07

@sonjachr said:

Many Thanks,
this works, I really appreciate your help!
I feel ashamed as I should have found the solution by myself. I will try to work harder on my Sketchup/Ruby knowledge, but I will never become an expert as you are.

Great, glad I could help.