Re: [Visualpython-users] Display problems when camera is too close to the center

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

Here's a simple example of zooming in without changing the center:

from visual import *
scene.range = 5
sphere(pos=(-1,0,0), radius=0.5, color=color.red)
box(pos=(1,0,0), color=color.cyan)
scene.mouse.getclick()
scene.range = 3
scene.mouse.getclick()
scene.range = 1

I'm not sure I've seen the effect you're referring to about being near 
the center. Perhaps you should post a specific example. If you do, 
please strip it down to the simplest test case you can find that 
illustrates your point.

Bruce Sherwood

Roberto Aguirre Maturana wrote:
> Hi, everybody:
>
> I am working on an application that uses VPython to navigate around 
> the spatial data in a way very similar to games like Quake (tm), so 
> you can fly around using a combination of keys w,a,s,d and changing 
> the forward direction with the mouse and left button (in a simmilar 
> way to stonegenhe.py).
>
> The problem is that the best results are obtained when 
> scene.mouse.camera is very close to scene.center. But when this 
> happens the rendering seems to fail, and objects look jagged and in 
> some cases you can see far objects that should be hidden behind closer 
> ones.
>
> Therefore, I have two questions:
>
> 1. Is there a way to solve the renderig problem on short camera-center 
> distances?
> 2. Is there a code way to move the camera away form the center without 
> changing the center position itself (that is, emulate the dragging of 
> left+right button by code)?
>
> Many thanks in advance.
>