Hi,
alternatively you can setup a geometry shader to run a second pass [1]:
layout(triangles) in;
layout(line_strip, max_vertices=6) out;
// (projection * view * model) matrix
uniform mat4 proj_view_model;
// length of the normal (object space)
uniform float normal_length;
in vec3 normal;
out NDData {
vec3 normal;
} nd_out;
void main() {
for (int i = 0; i < 3; i++) {
gl_Position = gl_in[i].gl_Position;
nd_out.normal = normal;
EmitVertex();
gl_Position = gl_in[i].gl_Position +
proj_view_model * vec4(normal * normal_length, 0.f);
nd_out.normal = normal;
EmitVertex();
EndPrimitive();
}
}
[1] from: https://wiki.delphigl.com/index.php/shader_normal_debug_330
Cheers
Sebastian
Hi everyone,
I have to debug a normal issue with my model, so I made a code to display them
(transform normals in a bunch of gl_lines and create a resulted geometry).
I share the gist in case it may help:
https://gist.github.com/fulezi/95a9ac319fd1cbeca1b18a4cde3986dc
Have a nice day,
Florian
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=72504#72504
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