Sorry. I did a mistake. I'm using float. :)

drivers: 61.77
video: GeForce FX 5200
more of the code:

uniform vec4 cam_pos;

varying vec4 vertex;
varying vec3 normal;

void main(void)

RenderMonkey (1.5) can't compile my shaders.

float res = dot(n,v);n,v - vec3. At this line I get an error: assignment of incompatible types. What's wrong?