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 but i get errors.
the code is:
Code:
vec3 n;
float d;
n = (pos1 -pos0) ^ (pos2 - pos1);
d = -n * pos0;
inside = 1.0;
if (dot(n, gl_Position) + w)
{
inside = 0.0;
}
the errors i get are:
Code:
VERTEX glCompileShader "" FAILED
VERTEX Shader "" infolog:
0(46) : error C1021: operands to "^" must be integral
glLinkProgram "eroded" FAILED
Program "eroded" infolog:
Vertex info
-----------
0(46) : error C1021: operands to "^" must be integral
Warning: detected OpenGL error 'invalid operation' after RenderBin::draw(,)
so i tried
Code:
vec3 n;
float w;
int p0 = (pos1 -pos0);
int p1 = (pos2 - pos1);
n = p0 ^ p1;
w = -n * pos0;
inside = 1.0;
if (dot(n, worldPos) + w)
{
inside = 0.0;
}
but it alway returns inside = 0.0;
any ideas?
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=13031#13031
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