some shaders

shade.frag

// fragment shader
#version 130

in vec4 ex_color;
in vec3 ex_nvect;
in vec3 ex_cvect;
in vec2 ex_tex1;

out vec4 end_result;

void main(void)
{
        vec4 tci;
 
        tci = ex_color * vec2(dot(ex_cvect,ex_nvect),0.0).xxxx;
 
        end_result = vec4(tci.xyz,1.0);
}

shade.vert

// vertex shader
#version 330

in vec3 pos;
in vec3 norm;
in vec4 color;
in vec2 tex1;

uniform mat4 projection;
uniform mat4 view;

out vec4 ex_color;
out vec3 ex_nvect;
out vec3 ex_cvect;
out vec2 ex_tex1;

void main(void)
{
        vec4 v_pos;

        v_pos = view * vec4(pos, 1.0);
        ex_cvect = normalize(vec3(0,0,0)-v_pos.xyz);
        ex_nvect = normalize((view * vec4(norm+pos,1)) - v_pos).xyz;

        ex_color = color;
        ex_tex1 = tex1;

        gl_Position = projection * v_pos;
}