The TriangleArray I'm using is not being translated in any way. All
triangles are modified throught a GeometryUpdater and passed back in by
reference. During initialization, I fill the TriangleArray with 400 tris
all at the origin. When one of the triangles is "fired", it's verticies
are simply modified and passed into the TriangleArray. This works great,
but only if you're within 1.0f radius of the origin, whereupon all tris
currently being displayed on screen just disappears. I checked the bounds
of the BranchGroup, and indeed it was centered at the origin with a radius
of 1.0f. I tried setting the bounds to Double.MAX_VALUE, but nothing
happens. I'm not sure how to disable auto_bounds_compute. It's not off by
default?
My basic set up is this:
BranchGroup
|
|
Shape3D
|
|
TriangleArray (by_reference, allow_ref_data_write/read, allow_count_write)
It's tempting to say that this is bug, but there were too many times I
thought there were bugs in java3D when they were really bugs in my code.
David Ko
On Mon, 18 Dec 2000, David wrote:
> I don't know. But off the top of my head:
>
> Have you tried disabling "auto bounds compute" and set your own bounds for
> the shape? I don't understand why this is happening. Is your triangle
> strip also being translated, or are you changing the actual vertices every
> frame for movement? If so it could be that bounds are not re-computed for
> each frame. I have never heard anyone else having issues with this before,
> so maybe this is something very specific to what you are doing. More
> information would be needed to help figure this out.
>
> But as far as just having a single triangle strip that spans from culled to
> non-culled space, and having it disappear... that I have never seen. I do
> water with a similar technique and I don't have any trouble seeing it
> everywhere I go.
>
> Dave Yazel
>
>
> ----- Original Message -----
> From: David Ko <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Monday, December 18, 2000 5:28 AM
> Subject: [JAVA3D] Frustum Culling
>
>
> Hello, I've asked this question before. I'll just rephrase it.
>
> How do you have prevent the view from culling out a BranchGroup from
> rendering, even if the BranchGroup's "sphere of influence" is outside the
> range of the view? I'm having trouble because my TriangleArray is being
> culled out, even though the triangles should be still be rendered.
> I've tried everything (i.e. setting bounds, specifying
> VISIBILITY_DRAW_ALL in View). Nothing!
>
> Any help, leads, or messages of pity would be appreciated.
>
> David Ko
>
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