Show only part of a LineStripArray?

[java3d-interest]

Hi,

I am building a scene which contains several 3D curves that I have modelled with individual LineStripArrays.  Each curve can contain several thousand 3D points.  Is there a way to only show part of the curve between a start point and end point?

My idea is that I can change the start and end points dynamically during animation so that the visible part of the curve appears to move along its path.

Thanks in advance
Dave
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[java3d-interest]

Hi,

the Java 3D API supports dynamical setting of an initial vertex index and a valid vertex count.

See the javadoc of GeometryArray for [b]setInitialVertexIndex(..)[/b] and [b]'setValidVertexCount(..)'[/b] for non-stripped subclasses. For a GeometryStripArray [b]'setStripVertexCounts(..)'[/b] has to be called. So, you might consider using a non-stripped LineArray.

Changing these attributes on a live scene requires to set the capability bit [b]GeometryArray.ALLOW_COUNT_WRITE[/b].

August
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[java3d-interest]

Thanks August,

It looks like this will do what I want.  I need to rework my code to take advantage of this.  If I get it to work, I will post a snippet.

Thanks again
Dave
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[java3d-interest]

Just an update on the above.  I tried changing the lineStripArrays to lineArrays and then changing the start vertex and vertex counts to animate the lines.  

However, this really slowed down the frame rate so I switched back to lineStripArrays.  To animate the lines I now change the coordinates of each point at each frame.  This means I need to keep the coordinates of each complete line in a separate array and then copy them across.

Dave
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[java3d-interest]

Shaders are good to animate lines.
But afaik some video cards (Intel) has no GLSL support  :(
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