Re: [Visualpython-users] visualization of colors

[Bruce S. <Bru...@nc...>]

Neither of you has it quite right. Kadir is correct that the problem is 
something to do with the graphics card or driver, because Marco was 
running a standard example (bounce.py), not writing a new program. 
Because I answered a personal note from Marco before I saw the same post 
by him in the list, I know that the issue isn't materials but any image 
whatsoever. He has a laptop, and probably he needs to update his 
graphics driver, or possibly his graphics card just doesn't support 
OpenGL properly.

Bruce Sherwood

Kadir Haldenbilen wrote:
> I believe Marco has a problem with materials setting.
> 
> It is highly likely that his display adapter does not support new 
> material types, so that they are all
> displayed dark blue.
> 
> Marco may need to switch materials off  in the sitesetings file at the 
> visual directory.
> 
> Kadir
> 
> ------------------------------------------------------------------------
> *From:* Scott David Daniels <Sco...@Ac...>
> *To:* vis...@li...
> *Sent:* Saturday, August 15, 2009 8:44:59 PM
> *Subject:* Re: [Visualpython-users] visualization of colors
> 
> marco bittelli wrote:
>  > I am starting to use Python and Visualpython. I am running the first 
> simple
>  > program with a 3D animation of a red ball bouncing on a blue floor. I
>  > installed
>  >
>  > Visual 5.11 released for Windows  and Python 2.6. The colors are not 
> showing
>  > well on the screen. For instance both the ball and the floor are dark 
> blue.
> 
> The human eye is not great with pure blue.  You could make it a paler
> blue by using a less monochrome color.  For example, you could simply go
> from a pure blue RGB (0.0, 0.0, 1.0) to increasing the "lightness" by
> adding a balanced amount of red and green (for example (.4, .4, 1.0)),
> or even pump up green since we are so good at seeing green: (.4, .6, 1).
> so, rather than "blue" in the demo, use one of these triples.
> 
> It may also be your lighting.  You could turn up the ambient some,
> (scene.ambient = .4, rather than the .2 default) for example, or add
> lights.  I think the default lighting has a "hole" from one direction,
> are you looking at the dark side of the demo?
> 
> to fiddle with all of this, do something simple:
>     import visual as vp
>     s = vp.sphere() # make a sphere (default color is white)
>     s.color = (.5, .6, .7) # try painting the sphere a new color
>     vp.scene.ambient # see ambient lighting (note it is colored light)
>     vp.scene.ambient = .4 # Set ambient to an intensity of white
>     t = vp.sphere(pos=(3,2,1), color=(1,.6,.4)) # create another sphere
> 
> --Scott David Daniels
> Sco...@Ac... <mailto:Sco...@Ac...>
> 
> 
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