Angled Planes

[sdraper69]

This is great, however it only seems to work if the section box is aligned to the XYZ axis.

I am trying to get it to work when the box is at any angle, however I cant get the shader to work right, i believe due to the camera position. I am working out the dot product but the results are not always correct. Heres my shader code...

fragmentClipping2: '
uniform vec3 color;
uniform vec3 clippingLow;
uniform vec3 clippingHigh;
uniform vec3 planeNormal1;
uniform vec3 planeNormal2;
uniform vec3 planeNormal3;
uniform vec3 planeNormal4;
uniform vec3 planeNormal5;
uniform vec3 planeNormal6;

uniform float planeDistance1;
uniform float planeDistance2;
uniform float planeDistance3;
uniform float planeDistance4;
uniform float planeDistance5;
uniform float planeDistance6;

uniform int reverse;

varying vec3 pixelNormal;
varying vec4 worldPosition;
varying vec3 camPosition;

bool isClipped(vec4 point){

vec4 planes[6];
planes[0]=vec4(planeNormal1.x,planeNormal1.y,planeNormal1.z,planeDistance1);
planes[1]=vec4(planeNormal2.x,planeNormal2.y,planeNormal2.z,planeDistance2);
planes[2]=vec4(planeNormal3.x,planeNormal3.y,planeNormal3.z,planeDistance3);
planes[3]=vec4(planeNormal4.x,planeNormal4.y,planeNormal4.z,planeDistance4);
planes[4]=vec4(planeNormal5.x,planeNormal5.y,planeNormal5.z,planeDistance5);
planes[5]=vec4(planeNormal6.x,planeNormal6.y,planeNormal6.z,planeDistance6);

for (int i=0;i<6;i++){
float dotProduct=dot(point.xyz,planes[i].xyz)+planes[i].w;
float dotProduct2=dot(camPosition.xyz,planes[i].xyz);

if(dotProduct<0.0 && dotProduct2 <0.0){
return true;
}

if(dotProduct<0.0 && dotProduct2>0.0){
return false;
}
}
return false;
}

void main( void ) {

float shade = (
3.0 * pow ( abs ( pixelNormal.y ), 2.0 )
+ 2.0 * pow ( abs ( pixelNormal.z ), 2.0 )
+ 1.0 * pow ( abs ( pixelNormal.x ), 2.0 )
) / 3.0;


if(isClipped(worldPosition)){

discard;
}
else{
gl_FragColor = vec4( color * shade, 1.0 );
return;
}
}'

looks good here...

but if i rotate the camera you can see its not capping correctly

Any help or suggestions would be greatly appriciated