Hello,
I have a quick question ;)
At the moment I am playing a little bit with lighting and material and
therefore I tried to use a shader. I set up a simple shapeDrawable
(sphere) and a vertex and fragment program. The code for the shaders I
found in a tutorial. It is posted bellow. I also enabled lighting und
light0 and set up values for these. What I get is really not phong. Just
some real white and black. Could there be a problem with the normals?
Greetings,
Marcus
VERT
varying vec3 normal;
varying vec3 v;
varying vec3 lightvec;
void main(void)
{
normal = normalize(gl_NormalMatrix * gl_Normal);
v = vec3(gl_ModelViewMatrix * gl_Vertex);
lightvec = normalize(gl_LightSource[0].position.xyz - v);
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}
FRAG
varying vec3 normal;
varying vec3 v;
varying vec3 lightvec;
void main(void)
{
vec3 Eye = normalize(-v);
vec3 Reflected = normalize( reflect( -lightvec, normal ));
//hat den selben effekt wie
//vec3 Reflected = normalize( 2.0 * dot(normal, lightvec) *
normal - lightvec);
vec4 IAmbient = gl_LightSource[0].ambient;
vec4 IDiffuse = gl_LightSource[0].diffuse * max(dot(normal,
lightvec), 0.0);
vec4 ISpecular = gl_LightSource[0].specular *
pow(max(dot(Reflected, Eye), 0.0), gl_FrontMaterial.shininess);
gl_FragColor = gl_FrontLightModelProduct.sceneColor + IAmbient
+ IDiffuse + ISpecular;
}
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