Frustrum - Revision history

EricChadwick: Moving content out of the overly-large Glossary page and back into individual pages

2015-03-17T19:12:28Z

Moving content out of the overly-large Glossary page and back into individual pages

Caustic: Redirected page to Glossary#Frustrum

2014-10-10T01:41:07Z

Redirected page to Glossary#Frustrum

Cheeseplus: 1 revision

2014-07-29T08:43:34Z

1 revision

BrandonPhoenix: created frustrum page

2010-08-12T21:38:44Z

created frustrum page

New page

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= Frustrum =

A term from traditional photography, it is the shape that the [[Viewer|viewer's]] [[FOV]] creates when projected into the scene. This pyramidal shape defines the limits of what the viewer can see, so it is used to calculate [[ClippingPlane|clipping]], [[CollisionDectection|collisions]], fog, etc.

Imagine your eyeball stuck to the top of a clear pyramid, looking straight down into it. The top-most point that is scratching against your eyeball is the near end of the frustum. You cannot see the side faces of the pyramid, because they are perpendicular to your eyeball, but you can see everything within the pyramid. In photography, this pyramid is infinitely tall, because in theory you can see to infinity.

In RT3D, the frustum is not infinitely long. It has near and far clipping planes to help reduce polygon counts. The near clipping plane cuts off the very top of the pyramid, while the far clipping plane defines the base of the pyramid.
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[[Category:Glossary]]

← Older revision		Revision as of 19:12, 17 March 2015
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−	~~#REDIRECT~~ [[Glossary~~#Frustrum~~]]	+	Frustrum is a term from traditional photography, the shape that the camera creates when projected into the scene. This pyramidal shape defines the limits of what the viewer can see, so it is used to calculate [[ClippingPlane\|clipping]], [[CollisionDectection\|collisions]], [[Fog]], etc.
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		+	Imagine your eyeball stuck to the top of a clear pyramid, looking straight down into it. The top-most point that is scratching against your eyeball is the near end of the frustum. You cannot see the side faces of the pyramid, because they are perpendicular to your eyeball, but you can see everything within the pyramid. In photography, this pyramid is infinitely tall, because in theory you can see to infinity.
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		+	In a game, the frustum is not infinitely long. It has near and far clipping planes to help reduce polygon counts, and improve the accuracy of the [[Z-Buffer]]. The near clipping plane cuts off the very top of the pyramid, while the far clipping plane defines the base of the pyramid.
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		+	[[Category:Glossary]][[Category:Rendering]]

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-__NOTOC__
+#REDIRECT [[Glossary#Frustrum]]
-{{:[[OutOfDate]]}}
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-= Frustrum =
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-A term from traditional photography, it is the shape that the [[Viewer|viewer's]] [[FOV]] creates when projected into the scene. This pyramidal shape defines the limits of what the viewer can see, so it is used to calculate [[ClippingPlane|clipping]], [[CollisionDectection|collisions]], fog, etc.
-−
-Imagine your eyeball stuck to the top of a clear pyramid, looking straight down into it. The top-most point that is scratching against your eyeball is the near end of the frustum. You cannot see the side faces of the pyramid, because they are perpendicular to your eyeball, but you can see everything within the pyramid. In photography, this pyramid is infinitely tall, because in theory you can see to infinity.
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-In RT3D, the frustum is not infinitely long. It has near and far clipping planes to help reduce polygon counts. The near clipping plane cuts off the very top of the pyramid, while the far clipping plane defines the base of the pyramid.
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-[[Category:Glossary]]

← Older revision	Revision as of 08:43, 29 July 2014
(No difference)