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PocketMatrix • View topic - Question about camera
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Question about camera


Question about camera

Postby PocketPlay » Jul 24, 2009 @ 12:04am

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Postby PocketPlay » Jul 25, 2009 @ 3:17pm

Do you guys even check this board anymore ? :?
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Postby edge » Jul 27, 2009 @ 1:15pm

Hi PocketPlay,

Your code seems fine, although I'm missing the Reset and WorldReset calls from your sample. Are you calling the reset functions before translating?
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Postby PocketPlay » Jul 27, 2009 @ 6:42pm

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Postby edge » Jul 28, 2009 @ 11:10am

Hi PocketPlay,

When translating the world, reverse the x, y and z parameters. Then it should work correctly.

If it still doesn't work, change the order of the translate and rotate calls.
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Postby PocketPlay » Jul 28, 2009 @ 1:57pm

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Postby PocketPlay » Jul 28, 2009 @ 11:54pm

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Postby Kak » Jul 29, 2009 @ 8:20am

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Postby PocketPlay » Jul 30, 2009 @ 12:55am

so I should call WorldTranslate
( 0, 0, 5000-player.getZ() )
instead of
( 0, 0, player.getZ()-5000) )

because of the z axis orientation?
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Postby edge » Jul 30, 2009 @ 9:38am

Hi PocketPlay,

You should call it like this:
Translate(0, 0, -player.getZ() - 5000);

The player position is inverted and the camera is placed 5000 units behind the player.
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Postby PocketPlay » Jul 31, 2009 @ 12:05am

yeah, allright. thanks.

I also have one more question: when I call

display->Perspective3D(display->GetWidth(), display->GetHeight(), 512, 0, 2000);

isn't the camera supposed to move at y = 2000 in the World coordinates? seems like it's always located at y = 0, even if I change those offset params.
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Postby PocketPlay » Aug 2, 2009 @ 1:23am

the reason I'm asking is because I 'm trying to render two models: player and floor. and for some reason, when I move the floor along Y axis sometimes it disappears.

could that be because the model is out of the camera view?
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Postby edge » Aug 5, 2009 @ 1:25pm

Hi PocketPlay,

The offset parameters to Perspective3D are for transforming the frustum and don't relate to world coordinates. In most cases you should use the default parameters for those.

It could be possible that the floor disappears if you're looking at the bottom of it, and not from the top. This happens when backface culling is enabled (polygons will only be viewed from the frontside and not from the backside).
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Postby PocketPlay » Aug 6, 2009 @ 4:44pm

that sounds very plausible.

is there any way I can disable this in Edgelib?
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Postby edge » Aug 11, 2009 @ 10:27am

Hi,

You can disable backface culling by calling glDisable(GL_CULL_FACE). You can also create 2 planes, one for each side and let them use the same coordinates ('attach' them to each other).
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