Re: [Visualpython-users] visualization of colors

[Kadir H. <kha...@ya...>]

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 <Scott.Daniels@Acm.Org>
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
Scott.Daniels@Acm.Org


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