Color interpolation across a face

[Dan Rathbun]

If you know the binary fileformat for some image filetype, you could write out a file in binary mode:

` img = File.open('myimage.bmp',"wb")

img.write(value)

...

img.close`

Then bring that image into your materials collection.

[Dan Rathbun]

Hmmm.. I'll need to think on that...

Have you been following what Aerilius' OnScreen GUI Toolkit

or: Chris Fullmer's On Screen GUI RGB Colorpicker

[Dan Rathbun]

To draw in OpenGL style (either 3D or 2D,) in SketchUp, must be done within a Tool class, using the View instance's family of draw methods.

see:
https://developers.google.com/sketchup/docs/ourdoc/view#draw

[Dan Rathbun]

So.. for color interpolation within a Tool class, when you set the color (just prior to painting a point,) with view.drawing_color=() you would evaluate the argument using color.blend

The receiver color would be color of one vertice, arg1 the other vertice's color, and the weight arg would be percentage ( Float) of the distance between the two vertices.

[thomthom]

The API doesn't let you set vertex colour. Wish it did.

[Dan Rathbun]

That's not what he wants.

He wants to draw multi-gradient color fill, on-the-fly.

[thomthom]

@dan rathbun said:

That's not what he wants.

He wants to draw multi-gradient color fill, on-the-fly.

Yes - and in OpenGL you do that by defining a colour for each vertex in a polygon where the shader then creates a gradient between each vertex colour across the polygon surface.

[Dan Rathbun]

Yep.. it would be nice to have more OpenGL draw functions.
Implementing a shader in Ruby is bound to be slow.

[Aerilius]

@dan rathbun said:

... you would evaluate the argument using color.blend

color.blend makes brown out of red and green.
In case you need a different interpolation (where you want red and green to result yellow), you need to write your own interpolation method, or take Color.interpolate(color1, color2,...) of https://bitbucket.org/Aerilius/color/wiki/Home

[ArunYoganandan]

Thanks everyone for the replies.

@Dan using the draw in a tool's view method looks like a plausible option. Let me dig into it and get back.

Thanks again.