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Re: Bounds3D

To: REALbasic Games <realbasic-games at lists dot realsoftware dot com>
Subject: Re: Bounds3D
From: "Joseph J. Strout" <joe at realsoftware dot com>
Date: Mon, 15 Aug 2005 10:50:31 -0600
Delivered-to: realbasic-games at lists dot realsoftware dot com
References: <0a64f2569014c15c578d5116b4d8e13b at pyramiddesign dot us> <a0620070dbf265db72822 at [10 dot 0 dot 1 dot 2]> <4fd41a4f80c528debca1c2b13e9b9259 at pyramiddesign dot us>
At 12:20 PM -0400 8/15/05, Joseph Nastasi wrote:

Sorry, the actual number is 1/10th that:
        Self.Planet.Bounds = New Bounds3D(New Vector3D,607813)

After executing this, the Radius is correct.

OK, that's certainly a reasonable number.

What happens is the if statement is satisfied when Self.Model.Position.Y is at 639,114 <-- corrected number

And what's the center of the planet bounds? I'm assuming it's <0,0,0> but it's worth checking.

Well, how big is your model?

Tiny, in comparison. But here's the odd thing. If I show the Bounds3D in the debugger, Center(!), Minimum and Maximum are all NIL.

The debugger shows those? I wouldn't expect it to show them at all. Have you tried logging them (e.g. to System.DebugLog)?

Radius is 20.22 and the Type is correctly set to 2, which _means_ we should be seeing Minimum and Maximum, not Radius (and center in all cases).

No, it doesn't mean anything of the sort. The properties available are always available, regardless of how you create the volume. If it's a spherical volume, then Minimum and Maximum are computed to enclose the sphere. If it's a box volume, then Center and Radius are computed to enclose the box. You can create it either way, and inspect it either way -- that's a feature.

Assume they are okay. The Model is at 0,0,0 with a Radius of 20.22. Planet.Position is at 0,-637989,0 and has a radius of 607813. Given this, it doesn't seem like the Intersect should have returned True. There should be 30156 of space between the two.

I agree. Can you reproduce this in a simple app -- create bounds1, create bounds2, show that they intersect when they shouldn't?

Best,
- Joe

--
Joe Strout                          REAL Software, Inc.

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