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diff --git a/pipermail/nel/2001-July/000463.html b/pipermail/nel/2001-July/000463.html new file mode 100644 index 00000000..fb0b7777 --- /dev/null +++ b/pipermail/nel/2001-July/000463.html @@ -0,0 +1,77 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> +<HTML> + <HEAD> + <TITLE> [Nel] culling and transforms</TITLE> + <LINK REL="Index" HREF="index.html" > + <LINK REL="made" HREF="mailto:berenguier%40nevrax.com"> + <LINK REL="Previous" HREF="000461.html"> + <LINK REL="Next" HREF="000464.html"> + </HEAD> + <BODY BGCOLOR="#ffffff"> + <H1>[Nel] culling and transforms</H1> + <B>Lionel Berenguier</B> + <A HREF="mailto:berenguier%40nevrax.com" + TITLE="[Nel] culling and transforms">berenguier@nevrax.com</A><BR> + <I>Mon, 2 Jul 2001 11:14:03 +0200</I> + <P><UL> + <LI> Previous message: <A HREF="000461.html">[Nel] [Flame][Offtopic] Congratulations + concerns</A></li> + <LI> Next message: <A HREF="000464.html">[Nel] A bit of news</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#463">[ date ]</a> + <a href="thread.html#463">[ thread ]</a> + <a href="subject.html#463">[ subject ]</a> + <a href="author.html#463">[ author ]</a> + </LI> + </UL> + <HR> +<!--beginarticle--> +<PRE>----- Original Message ----- +From: <<A HREF="mailto:stephane.craux@voila.fr">stephane.craux@voila.fr</A>> +To: <<A HREF="mailto:nel@nevrax.org">nel@nevrax.org</A>> +Sent: Saturday, June 30, 2001 12:21 PM +Subject: [Nel] culling and transforms + + +><i> Hi , +</I>><i> I Just took a look at nevrax code recently and +</I>><i> noticed that rather than transforming AABB when traversing +</I>><i> the scene graph , the choice was made to transform the +</I>><i> view frustum pyramid : it is much more cpu costly : +</I> +Is it not nearly the same? + +transform the planes: transform 6 planes => 6*16= 96 muls. +transform the AABB: transform 8 vectors => 8*12= 96 muls. + +But maybe your trick to transform an AABB is to just transform the center +(12), then transform the 3 half vectors of the AABB (3*3 because of their +axis form), and then just do some add ? (ooops :) ) + +regards + +Lionel. + + +</pre> + + + + + + + + +<!--endarticle--> + <HR> + <P><UL> + <!--threads--> + <LI> Previous message: <A HREF="000461.html">[Nel] [Flame][Offtopic] Congratulations + concerns</A></li> + <LI> Next message: <A HREF="000464.html">[Nel] A bit of news</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#463">[ date ]</a> + <a href="thread.html#463">[ thread ]</a> + <a href="subject.html#463">[ subject ]</a> + <a href="author.html#463">[ author ]</a> + </LI> + </UL> +</body></html> |