WorldViz User Forum - viz.vertex coordinates

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- - viz.vertex coordinates (https://forum.worldviz.com/showthread.php?t=2030)

lilio

05-13-2009 10:43 AM

viz.vertex coordinates

Hello,

I want to create a vertex at the mouseclick position, but I don't know how to do it.

If I create two vertex points:

Code:

viz.startlayer(viz.POINTS)

viz.pointsize(10)

viz.vertexcolor(viz.RED)

viz.vertex(0,0,10)

viz.vertex(1,1,10)

line = viz.endlayer()

And afterthat I click with my mouse at these points and look at my output window:

Code:

print viz.mouse.getPosition()

Then I had to recognize, that there are absolutly different values.

The vertex are at [0,0,10] and [1,1,10] and my mouseposition shows [0.6,0.3] and [0.5,0.2]!

Are the vertex coordinates world coordinates? Or what means 0,0,10? And what are the mouseposition coordinates?

What's the reason for this difference. I want to create vertex at the mouseclick position.

Can anybody help me - please.

lilio

05-14-2009 03:31 AM

If I create the vertex with this command:

Code:

point = viz.endlayer(viz.WORLD)

then the vertex will be placed at another position like the mouse is.

But if I use

Code:

point = viz.endlayer(viz.SCREEN)

then the vertex will be placed at the mouseclick position.

But I don't want to place the vertex at the screen. It should be placed in the world at the mouseposition and at 0 on the z-axis.

I hope somebody understand my problem.

I only want to create a vertex in the world (not at the screen), but exactly at the mouseposition.

Is this possible?

Gladsomebeast

05-14-2009 10:56 AM

Use the "screentoworld" method to get a direction vector. Then use vizmat.MoveAlongVector to find a place in space.

Chrissy2009

05-15-2009 04:25 AM

Hey Gladsomebeast,

I've got the same problem. I want to create points in the world, not on the screen.

But I don't understand your answer. Could you write down the code, please?

THANKS!

Gladsomebeast

05-15-2009 11:58 AM

Looks like we don't need MoveAlongVector. Got this code from viztracker.py:

Code:

line = viz.screentoworld(viz.Mouse.getPosition())

line.length = desiredMetersFromView

print line.end

Chrissy2009

05-16-2009 09:09 AM

Oh great, thanks a lot!!

Gladsomebeast

05-16-2009 04:36 PM

Helping make me happy.

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