Re: [osg-users] vertex shader help: compare position against plane

umituzun84 wrote: > Hi Paul; > > Watch the video. It can tell you much of dot and cross product :) > > http://video.google.com/videosearch?q=cross+product&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&ei=LE4dSreZCpLt_AbS4OGxDQ&sa=X&oi=video_result_group&resnum=4&ct=title

Re: [osg-users] vertex shader help: compare position against plane

Hi Paul; Watch the video. It can tell you much of dot and cross product :) http://video.google.com/videosearch?q=cross+product&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&ei=LE4dSreZCpLt_AbS4OGxDQ&sa=X&oi=video_result_group&resnum=4&ct=title# Regards. 2009/5/27 Paul G

Re: [osg-users] vertex shader help: compare position against plane

Kim C Bale wrote: > I presume this line: > > n = (pos1 -pos0) ^ (pos2 - pos1); > > is a cross product of two vectors. i.e. the normal, also known as the > vector perpendicular to the two vectors that define the plane. > > In which case you would want to use the glsl function cross(vec3,vec3) >

Re: [osg-users] vertex shader help: compare position against plane

...@lists.openscenegraph.org] On Behalf Of Paul Griffiths Sent: 27 May 2009 13:40 To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] vertex shader help: compare position against plane ok, i got the world position with: Code: mat4 ToWorldMatrix= osg_ViewMatrixInverse* gl_ModelViewMatrix; vec3 worldPos

Re: [osg-users] vertex shader help: compare position against plane

ok, i got the world position with: Code: mat4 ToWorldMatrix= osg_ViewMatrixInverse* gl_ModelViewMatrix; vec3 worldPos = ToWorldMatrix * gl_Vertex; now i need to check which side of the plane the worldPos is. I googled and found some code for this but its not for glsl, ive came up with this b

Re: [osg-users] vertex shader help: compare position against plane

al Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Paul Griffiths Sent: 27 May 2009 12:02 To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] vertex shader help: compare position against plane I know the code: vec

Re: [osg-users] vertex shader help: compare position against plane

I know the code: vec3 worldPos = gl_ModelViewMatrix * gl_Vertex; is worng, if i rotate the view so does this position. i need the world position and not the modelview position. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=13023#13023