Is that possible to create some connection between to sphere?

[haohaoxuexi1]

For example, I add two spheres into Vizard to represent the joints.

However, I want to create a line or some other things which can connect these two joints.

When the position of the joints change, the line will move follow the joints.

Thanks.

[Jeff]

You could create an on-the-fly line to connect the two spheres.

[haohaoxuexi1]

Originally Posted by Jeff

You could create an on-the-fly line to connect the two spheres.

import viz,vizact,vizshape, vizmat

viz.go()
grid = vizshape.addGrid() 

sphere_0_left = vizshape.addSphere(radius=0.1)
sphere_1_left = vizshape.addSphere(radius=0.1)

So how to connect this two sphere using on the fly

[Jeff]

If you want to draw a line, create a layer with viz.lines and use the center point of each sphere as a vertex. You can update the vertex positions as the sphere positions change.

[haohaoxuexi1]

Originally Posted by Jeff

If you want to draw a line, create a layer with viz.lines and use the center point of each sphere as a vertex. You can update the vertex positions as the sphere positions change.

in that way, the system will repeat drawing the line as many as the times of position changes.

is there a way to draw one line and keep updating the position

[Jeff]

Yes, once you create the line you can move it like any other object:

import viz
import vizshape

viz.go()

viz.clearcolor(viz.SLATE)
vizshape.addGrid()

viz.startLayer(viz.LINES) 
viz.vertex(0,0,0)  
viz.vertex(0,1,0) 
line = viz.endLayer() 

line.setPosition([2,0,7])
line.color(viz.RED)

[haohaoxuexi1]

Originally Posted by Jeff

Yes, once you create the line you can move it like any other object:

import viz
import vizshape

viz.go()

viz.clearcolor(viz.SLATE)
vizshape.addGrid()

viz.startLayer(viz.LINES) 
viz.vertex(0,0,0)  
viz.vertex(0,1,0) 
line = viz.endLayer() 

line.setPosition([2,0,7])
line.color(viz.RED)

Is there a way to change the position of line only by change the vertex of it?

In the code you gave to me, the length of the line is fixed, is that possible to get a line which will change its length according to the position of vertex?

[haohaoxuexi1]

Originally Posted by Jeff

Yes, once you create the line you can move it like any other object:

import viz
import vizshape

viz.go()

viz.clearcolor(viz.SLATE)
vizshape.addGrid()

viz.startLayer(viz.LINES) 
viz.vertex(0,0,0)  
viz.vertex(0,1,0) 
line = viz.endLayer() 

line.setPosition([2,0,7])
line.color(viz.RED)

can you help me to solve my last question?

[Jeff]

Yes, you can modify vertices to change the length of the line. Take a look at the changing vertices page from the on-the-fly section. Does this help answer your question?

[haohaoxuexi1]

Originally Posted by Jeff

Yes, you can modify vertices to change the length of the line. Take a look at the changing vertices page from the on-the-fly section. Does this help answer your question?

fixed it, thanks