[vtkusers] How to visualize angular velocity of spherical particles?

[Rasmus Hemph]

Hi Sean, thanks for you reply! 
This is a nicer way to show rotation than through the angular
velocity-vector, I think I will try it out.
Ideally, i would like the texture map to move an particle-dependant
instant in the arrow direction at each timestep to visualize the angular
velocity as well as the direction of rotation. Is there a way to
pursuade a VTK texture map to do that?

//Rasmus


On Thu, 2004-09-16 at 07:39, Sean McInerney wrote:
> How about texture mapping a bitmap of some arrows onto the sphere and 
> then using vtkGlyph3D to position and orient each sphere? The bitmap 
> could be something like this:
> 
> +--------------------+
> |                    |
> |                    |
> |                    |
> |      |\        |\  |
> | +----+ \  +----+ \ |
> | |       \ |       \|
> | |       / |       /|
> | +----+ /  +----+ / |
> |      |/        |/  |
> |                    |
> |                    |
> |                    |
> +--------------------+
> 
> -Sean
> 
> Rasmus Hemph wrote:
> > I am simulating approximately 100 particles wich are moving and
> > colliding in a 3D box-like domain. I am able to attach a spherical glyph
> > to each particle point in my field using vtk and tcl, which gives a nice
> > visualization. 
> > 
> > My problem is that I want to somehow show the angular velocity of the
> > spheres. The simulations gives me an angular velocity vector omega,
> > which I map to the particle points, and that gives me an idea of the
> > rotation. However this is not very intuitive, and it would be much nicer
> > if I could color half of the sphere in some other color and rotate that
> > half in the direction of the angular velocity vector in each timestep. 
> > 
> > I have so far created that "half sphere" but have not yet come up with a
> > good way of rotating that at each timestep in the omega direction
> > (different omega for all spheres). I would think that somebody has come
> > across this problem before, and I am hoping for suggestions of some
> > kind.
> > 
> > On the bottom of http://www.tfd.chalmers.se/~md8hemra/modeling.html
> > I have a 2D-movie-version (created in matlab) of what I want to achieve
> > in 3D.
> > 
> > Thanks in advance.
> > 
> > 
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