setBackClipDistance and 3d shapes

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SD - 24 Apr 2004 23:44 GMT

I have a sphere in my Universe that I transform to (0,0,-57).

First question, that means my sphere is 57 meters away in the z-plane
right?

If I change the transform to use -56 instead I can see the sphere, but
at -57 I can't.

If I increase the BackClipDistance then I can see the sphere at -57.

Second question is why do the two measurements (BackClipDistance and
sphere location) seem out of sync with each other. The default
BackClipDistance is 10 meters, but my sphere is 56 or 57 meters away.
Doesn't that mean I should be able to see either sphere? But I can see
one, not the other.

Can someone please explain this.

Thank you. SD.

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Petra Neumann - 25 Apr 2004 14:39 GMT

> I have a sphere in my Universe that I transform to (0,0,-57).
>
> First question, that means my sphere is 57 meters away in the z-plane
> right?

the sphere is at 57 units away from the origin on the negative z-axis.
That means the sphere lies with its center in the x-z -plane.

> If I change the transform to use -56 instead I can see the sphere, but
> at -57 I can't.
>
> If I increase the BackClipDistance then I can see the sphere at -57.

What do you increase it to?

> Second question is why do the two measurements (BackClipDistance and
> sphere location) seem out of sync with each other. The default
> BackClipDistance is 10 meters, but my sphere is 56 or 57 meters away.
> Doesn't that mean I should be able to see either sphere? But I can see
> one, not the other.

That really depends on where your virtual camera is located (or here
rather the viewplatform). If your viewplatform is at the nominal
viewing distance and you didn't change the backclip distance you
shouldn't see either sphere.
If your viewplatform resides at (0,0,-46.5) and your clip distance is
still 10 you can see the sphere at -56 but not the one at -57.

Petra

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setBackClipDistance and 3d shapes

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