[Plugin] Color by Slope

icepam · 17 Jul 2009, 21:33

@mike lucey said:

Thanks Chris, I wonder what it could be used for, other than visual effects? Has anyone any ideas .... I probably end up saying Doh!

It is an amazing utility if you work with landscape and terrains. I'm an urban designer and architect and I use it for example to figure out which parts of a terrain are too steep to build on etc.

geologists use slope analysis to figure out if there is any danger of landslides, and landscape designers to figure out what they can plant where.

you can also use it to figure out if snowfall will build on certain areas and not others.

and from a "image creation" perspective, if you combine the color by slope and the color by z, you could "automatically" create procedural maps of materials for example if you have a mountain, you can cover the highest parts with snow, the flat parts with grass, and the sheer parts with rock

Mike Lucey · 17 Jul 2009, 23:52

Thanks Icepam for that informitive description, and yes I agree that Colour by Slope would be invaluable in these cases.

JClements · 18 Jul 2009, 16:38

Mike:

For freeform shapes, I can see where it could be used as a contrasting tool (like bumping up the contrast in your photoediting software) where SU's builtin Sun for Shading doesn't quite do the trick.

I am wondering if you could start with a grayscale mapping of the surface slopes, then take the grayscale value for each surface and tweek the HLS value of colors used for the surface, create a Palette of these shades, and apply them to their respective surfaces.

Didier Bur · 18 Jul 2009, 23:32

Hi,

@unknownuser said:

you could start with a grayscale mapping of the surface slopes, then take the grayscale value for each surface and tweek the HLS value of colors used for the surface, create a Palette of these shades, and apply them to their respective surfaces

I've done something similar (well, sort of) in my "paint_altitude_faces.rb" veeeeery ooooold script. Go look into it if it can help, it is not crypted

mattg · 19 Aug 2009, 12:13

Chris,

Was just wondering if you updated your version of the script with all the new inclusions? No offense intended, but im not sure how stable or whatever the other versions are.

Cheers.

-Matt

olishea · 19 Aug 2009, 16:09

thanks for this plugin. im a big fan of your color by z plugin too, I use it far too often!

Chris Fullmer · 1 Sept 2009, 01:20

UPDATE! version 1.5 available. (But not much changed, just compiled all the scripts that had been lying around this thread, and now I've uploaded it to smustard to host).

@MattG, sorry it took so long to respond here! Yes, the other versions that were posted were quite stable. I've now consolidated everything into a single script and uploaded it to smustard.com:

@Olishea - thanks! I'm glad you like these scripts It always nice to know poeple use some of them.

Download
http://www.smustard.com/script/ColorBySlope

So go there now to download the final version of this script (I made one or two minor tweaks that might improve the speed, but I wouldn't count on it).

mattg · 1 Sept 2009, 11:44

Nah no worries.
Thankyou so much for this and all you other scripts - you're an absolute legend!

Ecuadorian · 17 Sept 2009, 20:46

Thank you, Chris!

I could have used this when I was a student, as I had to do it manually for Urban Design class. You know, to decide which parts of a site to use for housing, which ones for parks, which ones not to use at all, etc.

riboflavele · 20 Apr 2010, 19:03

I im trying to use this script, but i want to know its possible to change the colors and is it possible to know the slope % vs colors...? im not sure if my question is clear... Is it possible to have a legend or somthing to see for example that blue = 0% to 20% of slope and red = 40% to 60% of slope...

Sorry for my english...

TIG · 20 Apr 2010, 20:20

See
mat.color=[(255-value),value,value]
line #56~
Sets the face color, value is set by the angle...
Edit it there...

halsktchup · 27 Jun 2010, 18:38

TIG, Chris,

Thanks for the color by slope script. Like another person in here, I too am trying to see if I can get specific colors for specific slopes. Is there a later version to your script on smustard that contains this? For example if I need a certain red for anything above 20% slope, how do I get that?

Thanks.

Chris Fullmer · 27 Jun 2010, 22:33

Hey, so far the script does not do that. I do plan on implementing it eventually. I've got a super busy week and I do not anticipate being able to look at it right away, but it might be easy enough to just tweak some lines of code to make it work how you want. Maybe by next weekend I'll be able to look at it.

Chris

TIG · 28 Jun 2010, 08:32

Hope I'm not standing on any toes...

### edited/replace the code from here................
faces = []
flat = []
angle = 0.0
sel.each do |e|
  faces << e if e.is_a? Sketchup;;Face
end#do
### first set up some [r,g,b] colors for various slope angles
### we use them if they exist, but if not make them...
if not color_00_20 = model.materials["color_00_20"]
  color_00_20 = model.materials.add("color_00_20")
  color_00_20.color= [120,0,0]
end#if
if not color_20_40 = model.materials["color_20_40"]
  color_20_40 = model.materials.add("color_20_40")
  color_20_40.color= [150,0,0]
end#if
if not color_40_60 = model.materials["color_40_60"]
  color_40_60 = model.materials.add("color_40_60")
  color_40_60.color= [180,0,0]
end#if
if not color_60_80 = model.materials["color_60_80"]
  color_60_80 = model.materials.add("color_60_80")
  color_60_80.color= [210,0,0]
end#if
if not color_80_90 = model.materials["color_80_90"]
  color_80_90 = model.materials.add("color_80_00")
  color_80_90.color= [240,0,0]
end#if
### you can adjust the colors' rgb values to suit...
###
faces.each do |e|
  enorm = e.normal
  flat = Geom;;Vector3d.new(enorm[0],enorm[1],0)
  angle = (flat.angle_between enorm).radians ### angle in in degrees
  ### now set up the tests for different angles
  ### change these test ranges etc to suit your requirements...
  if angle>=0.0 and angle<=20.0
    color=color_00_20
  elsif angle>20.0 and angle<=40.0
    color=color_30_40
  elsif angle>40.0 and angle<=60.0
    color=color_40_60
  elsif angle>60.0 and angle<=80.0
    color=color_60_80
  else ### angle>80.0
    color=color_80_90
  end#if
  e.material = color
  e.back_material = color
end#do
### end of edit/replace.................

Make a backup copy of the original ruby script outside of the Plugins folder so it won't try load twice. If you mess up then you have the original to use again...
Now edit/replace the version that's still in the Plugins folder, as set out above [open with Notepad.exe or equivalent plain-text editor].
Save it and restart Sketchup - all slopes should now be colored in the angle-ranges and colors you've specified...

Chris Fullmer · 28 Jun 2010, 16:49

@tig said:

Hope I'm not standing on any toes...

Nope, not at all! Thanks TIG,

Chris

anilnimesh · 3 Nov 2010, 13:53

Color by angle by you is amazing...
rather i had changed name of the tool as 'Slope by angle'

wow! ur work is amazing.

Please brief about color assignments in case of 'color by Slope'?

About myself, i m an Architect from India and doing practice in Delhi.
regards,
Anil Nimesh

Chris Fullmer · 3 Nov 2010, 15:37

@anilnimesh said:

Please brief about color assignments in case of 'color by Slope'?

Thanks for using my plugin. I'm not entirely sure what you are requesting though. Let me know if there is a feature you think should be added, thanks!

Chris

anilnimesh · 3 Nov 2010, 16:00

Hi Chris,
i using sketchu pro v7.
while using the tool, it is bit difficult to understand, which color is applied for which slope. i need to calculate, hw the tool is working?
is there any color which defines slope (like 0-5% or 5%-10%) in slabs? i mean say 'red' for slope slab 0-5%

u wrote highest color no. is for low gradient and vice versa. u also wrote to explode the group (containing the terrain) and select color and make a new group out of those.

i tried but found it little tidious...

althought it is much simplied then what we do manually.. but i need to understand more about your tool.

u also made a new one for v8 where it is called 'Color by slope stepped'. i found the previous one more relevant for my work.

so i need to know that can the tool defines colors w.r.t. slope in slabs (like 0-5% or 5%-10%) ?

regrds,

Agama · 21 Mar 2011, 19:14

@tig said:

Hope I'm not standing on any toes...

### edited/replace the code from here................
> faces = []
> flat = []
> angle = 0.0
> sel.each do |e|
>   faces << e if e.is_a? Sketchup;;Face
> end#do
> ### first set up some [r,g,b] colors for various slope angles
> ### we use them if they exist, but if not make them...
> if not color_00_20 = model.materials["color_00_20"]
>   color_00_20 = model.materials.add("color_00_20")
>   color_00_20.color= [120,0,0]
> end#if
> if not color_20_40 = model.materials["color_20_40"]
>   color_20_40 = model.materials.add("color_20_40")
>   color_20_40.color= [150,0,0]
> end#if
> if not color_40_60 = model.materials["color_40_60"]
>   color_40_60 = model.materials.add("color_40_60")
>   color_40_60.color= [180,0,0]
> end#if
> if not color_60_80 = model.materials["color_60_80"]
>   color_60_80 = model.materials.add("color_60_80")
>   color_60_80.color= [210,0,0]
> end#if
> if not color_80_90 = model.materials["color_80_90"]
>   color_80_90 = model.materials.add("color_80_00")
>   color_80_90.color= [240,0,0]
> end#if
> ### you can adjust the colors' rgb values to suit...
> ###
> faces.each do |e|
>   enorm = e.normal
>   flat = Geom;;Vector3d.new(enorm[0],enorm[1],0)
>   angle = (flat.angle_between enorm).radians ### angle in in degrees
>   ### now set up the tests for different angles
>   ### change these test ranges etc to suit your requirements...
>   if angle>=0.0 and angle<=20.0
>     color=color_00_20
>   elsif angle>20.0 and angle<=40.0
>     color=color_30_40
>   elsif angle>40.0 and angle<=60.0
>     color=color_40_60
>   elsif angle>60.0 and angle<=80.0
>     color=color_60_80
>   else ### angle>80.0
>     color=color_80_90
>   end#if
>   e.material = color
>   e.back_material = color
> end#do
> ### end of edit/replace.................
>

Make a backup copy of the original ruby script outside of the Plugins folder so it won't try load twice. If you mess up then you have the original to use again...

Now edit/replace the version that's still in the Plugins folder, as set out above [open with Notepad.exe or equivalent plain-text editor].
Save it and restart Sketchup - all slopes should now be colored in the angle-ranges and colors you've specified...

Hello,
Can you please explain how to do it 'step by step'? I've never used ruby script, however this tool will be very usefull for me if I can influence the slope colours.
Thank you for your help:)

dansphere · 2 Nov 2011, 20:30

Yes I'm also having trouble, I've had a shot at changing the ruby but no luck.
Perhaps a logarithmic function for the assignment of colour to slope angle would work well, and then being able to reverse the log direction.. ??

Dan