Hi Paul,
I guess the problem is related to the "varying". AFAIR it is
interpolated over the primitive. So maybe this is the problem.
The other odd thing is that you do
if (inside) discard;
instead of
if (inside == 1.0) discard;
cheers
Sebastian
Hi,
Im trying to use a shader to make parts of models transparant(clipped) i was
using a clipnode but learned you cant use more than one in a scene? or am i
wrong?
anyway, i wish to clip along a plane.
currently this plane is defined as 3 points:
Code:
varying vec3 pos0;
varying vec3 pos1;
varying vec3 pos2;
currently set as:
Code:
pos0.x = 0.0;
pos0.y = 0.0;
pos0.z = 0.0;
pos1.x = 0.0;
pos1.y = 1.0;
pos1.z = 0.0;
pos2.x = 0.0;
pos2.y = 0.0;
pos2.z = 1.0;
how do i check which side the current world position is compared to this plane?
ive tried
Code:
varying float inside;
...
vec3 worldPos = gl_ModelViewMatrix * gl_Vertex;
inside = 1.0;
if (worldPos.x < pos0.x)
{
inside = 0.0;
}
and inside my fragment shader im simply using
Code:
if (inside) discard;
which does cut the model in half but its jagged. its not removing pixels but
the whole vertex.
it is wrong. how do i get the current world position with the vertex shader?
and how can i check this position compared to the plane?
the example code above just checks x axis, i need all 3.
...
Thank you!
Cheers,
PaulG
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=13020#13020
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