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DarkBASIC Discussion / Can someone explain collisionHitNorm vs collisionHit in NG please?

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One Ton Tadpole
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Posted: 7th Aug 2004 04:53
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Or more specifically, what is a normal?

I get the point of CollisionHit - returns me the point of contact on a particular axis for that object.

But what is the normal of an object? Calling all maths people - help me out here...

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Lost in Thought
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Posted: 7th Aug 2004 05:48
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The normal is the angle at which the collision occurs. I think it is the angle of collision divided by 360?

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Phaelax
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Posted: 7th Aug 2004 08:57
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no, the normal pertains to the polygon face at which the collision occurs. It's a perpendicular vector to that face, which would most often be used to align objects to it such as bullet hole marks.

"eureka" - Archimedes
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One Ton Tadpole
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Posted: 7th Aug 2004 18:26
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Can anyone expand on that, or direct me to a website with tutorials on this sort of stuff?

I can understand polygons, know what perpendicular means, and have an inkling about vectors; but I'm lost when this command chucks a number back at me - I don't know what it specifically means or how I can use it.

The NG help page assumes we know all about normals, you see.
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Phaelax
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Posted: 8th Aug 2004 03:22
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If you don't know what a polygon is nor what perpendicular means, I suggest you pick up a really basic math book. Those are terms taught in grade school.

polygon = shape
perpendicular = forms a right angle(90 degrees)

"eureka" - Archimedes
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the_winch
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Posted: 8th Aug 2004 11:29
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http://web3d.vapourtech.com/tutorials/vrml97/en/tut25.html

it's cool to hate
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One Ton Tadpole
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Posted: 9th Aug 2004 02:11
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No, no Phaelax - i *DO* know what a polygon is, as what perpendicular means.

Quote, earlier post:
"I can understand polygons, know what perpendicular means, and have an inkling about vectors"

It's the stuff about vectors and stuff I'm lagging behind on. Thanks for the tutorial link, winch

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nuclear glory
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Posted: 9th Aug 2004 12:19
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The NG tutorials:

http://www.nuclearglory.com/tutorials.php

Vectors and normals are covered.

Lead Programmer/Director
Powerful Collision DLL for DBPro and DBC: http://www.nuclearglory.com
Lightwave Scene Exporter to .X also at: http://www.nuclearglory.com
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Phaelax
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Posted: 10th Aug 2004 14:21
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my bad.

"eureka" - Archimedes
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