OOVoxel.m File Reference

import "OOMaths.h"

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Functions
int	checkFace (Vector p, GLfloat rd)
int	checkBevel (Vector p, GLfloat rd)
int	checkCorner (Vector p, GLfloat rd)
Vector	lineIntersectionWithFace (Vector p1, Vector p2, long mask, GLfloat rd)
int	checkPoint (Vector p1, Vector p2, GLfloat alpha, long mask, GLfloat rd)
int	checkLine (Vector p1, Vector p2, int mask, GLfloat rd)
int	lineCubeIntersection (Vector v0, Vector v1, GLfloat rd)

Function Documentation

checkBevel()

int checkBevel	(	Vector	p,
		GLfloat	rd )

Definition at line 43 of file OOVoxel.m.

{
    GLfloat r2 = rd * 2;
    int bevels = 0;
    if ( p.x + p.y > r2) bevels |= 0x001;
    if ( p.x - p.y > r2) bevels |= 0x002;
    if (-p.x + p.y > r2) bevels |= 0x004;
    if (-p.x - p.y > r2) bevels |= 0x008;
    if ( p.x + p.z > r2) bevels |= 0x010;
    if ( p.x - p.z > r2) bevels |= 0x020;
    if (-p.x + p.z > r2) bevels |= 0x040;
    if (-p.x - p.z > r2) bevels |= 0x080;
    if ( p.y + p.z > r2) bevels |= 0x100;
    if ( p.y - p.z > r2) bevels |= 0x200;
    if (-p.y + p.z > r2) bevels |= 0x400;
    if (-p.y - p.z > r2) bevels |= 0x800;
    return bevels;
}

Referenced by lineCubeIntersection().

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checkCorner()

int checkCorner	(	Vector	p,
		GLfloat	rd )

Definition at line 62 of file OOVoxel.m.

{
    GLfloat r3 = rd * 3;
    int corners = 0;
    if (( p.x + p.y + p.z) > r3) corners |= 0x01;
    if (( p.x + p.y - p.z) > r3) corners |= 0x02;
    if (( p.x - p.y + p.z) > r3) corners |= 0x04;
    if (( p.x - p.y - p.z) > r3) corners |= 0x08;
    if ((-p.x + p.y + p.z) > r3) corners |= 0x10;
    if ((-p.x + p.y - p.z) > r3) corners |= 0x20;
    if ((-p.x - p.y + p.z) > r3) corners |= 0x40;
    if ((-p.x - p.y - p.z) > r3) corners |= 0x80;
    return corners;
}

Referenced by lineCubeIntersection().

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checkFace()

int checkFace	(	Vector	p,
		GLfloat	rd )

Definition at line 31 of file OOVoxel.m.

{
    int faces = 0;
    if (p.x >  rd) faces |= CUBE_FACE_RIGHT;    // right
    if (p.x < -rd) faces |= CUBE_FACE_LEFT;     // left
    if (p.y >  rd) faces |= CUBE_FACE_TOP;      // above
    if (p.y < -rd) faces |= CUBE_FACE_BOTTOM;   // below
    if (p.z >  rd) faces |= CUBE_FACE_FRONT;    // ahead
    if (p.z < -rd) faces |= CUBE_FACE_BACK;     // behind
    return faces ;
}

Referenced by checkPoint(), and lineCubeIntersection().

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checkLine()

int checkLine	(	Vector	p1,
		Vector	p2,
		int	mask,
		GLfloat	rd )

Definition at line 120 of file OOVoxel.m.

{
    int result = 0;
    if ((CUBE_FACE_RIGHT & mask) && (p1.x > p2.x) && (checkPoint( p1, p2, (rd-p1.x)/(p2.x-p1.x), 0x3f - CUBE_FACE_RIGHT, rd) == 0))     // right
        result |= CUBE_FACE_RIGHT;
    if ((CUBE_FACE_LEFT & mask) && (p1.x < p2.x) && (checkPoint( p1, p2, (-rd-p1.x)/(p2.x-p1.x), 0x3f - CUBE_FACE_LEFT, rd) == 0))      // left
        result |= CUBE_FACE_LEFT;
    if ((CUBE_FACE_TOP & mask) && (p1.y > p2.y) && (checkPoint( p1, p2, (rd-p1.y)/(p2.y-p1.y), 0x3f - CUBE_FACE_TOP, rd) == 0))         // above
        result |= CUBE_FACE_TOP;
    if ((CUBE_FACE_BOTTOM & mask) && (p1.y < p2.y) && (checkPoint( p1, p2, (-rd-p1.y)/(p2.y-p1.y), 0x3f - CUBE_FACE_BOTTOM, rd) == 0))  // below
        result |= CUBE_FACE_BOTTOM;
    if ((CUBE_FACE_FRONT & mask) && (p1.z > p2.z) && (checkPoint( p1, p2, (rd-p1.z)/(p2.z-p1.z), 0x3f - CUBE_FACE_FRONT, rd) == 0))     // ahead
        result |= CUBE_FACE_FRONT;
    if ((CUBE_FACE_BACK & mask) && (p1.z < p2.z) && (checkPoint( p1, p2, (-rd-p1.z)/(p2.z-p1.z), 0x3f - CUBE_FACE_BACK, rd) == 0))      // behind
        result |= CUBE_FACE_BACK;
    return result;
}

References checkPoint().

Referenced by lineCubeIntersection().

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checkPoint()

int checkPoint	(	Vector	p1,
		Vector	p2,
		GLfloat	alpha,
		long	mask,
		GLfloat	rd )

Definition at line 111 of file OOVoxel.m.

{
    Vector pp;
    pp.x = p1.x + alpha * (p2.x - p1.x);
    pp.y = p1.y + alpha * (p2.y - p1.y);
    pp.z = p1.z + alpha * (p2.z - p1.z);
    return (checkFace( pp, rd) & mask);
}

References checkFace().

Referenced by checkLine().

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lineCubeIntersection()

int lineCubeIntersection	(	Vector	v0,
		Vector	v1,
		GLfloat	rd )

Definition at line 140 of file OOVoxel.m.

{
    int v0_test, v1_test;
 
    //  compare both vertexes with all six face-planes 
    //
    if ((v0_test = checkFace( v0, rd)) == 0)
        return -1;  // v0 is inside the cube
    if ((v1_test = checkFace( v1, rd)) == 0)
        return -1;  // v1 is inside the cube
    
    // check they're not both outside one face-plane
    //
    if ((v0_test & v1_test) != 0)
        return 0;   // both v0 and v1 are outside the same face of the cube
 
    //  Now do the same test for the 12 edge planes 
    //
    v0_test |= checkBevel( v0, rd) << 8; 
    v1_test |= checkBevel( v1, rd) << 8; 
    if ((v0_test & v1_test) != 0)
        return 0; // v0 and v1 outside of the same bevel  
 
    //  Now do the same test for the 8 corner planes
    //
    v0_test |= checkCorner( v0, rd) << 24; 
    v1_test |= checkCorner( v1, rd) << 24; 
    if ((v0_test & v1_test) != 0)
        return 0; // v0 and v1 outside of same corner   
 
    // see if the v0-->v1 line intersects the cube.
    //
    return checkLine( v0, v1, v0_test | v1_test, rd);
}

References checkBevel(), checkCorner(), checkFace(), and checkLine().

Referenced by Octree::isHitByLine.

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lineIntersectionWithFace()

Vector lineIntersectionWithFace	(	Vector	p1,
		Vector	p2,
		long	mask,
		GLfloat	rd )

Definition at line 77 of file OOVoxel.m.

{
    if (CUBE_FACE_RIGHT & mask)
        return make_vector( rd,
                            p1.y + (p2.y - p1.y) * (rd - p1.x) / (p2.x - p1.x),
                            p1.z + (p2.z - p1.z) * (rd - p1.x) / (p2.x - p1.x));
    
    if (CUBE_FACE_LEFT & mask)
        return make_vector( -rd,
                            p1.y + (p2.y - p1.y) * (-rd - p1.x) / (p2.x - p1.x),
                            p1.z + (p2.z - p1.z) * (-rd - p1.x) / (p2.x - p1.x));
    
    if (CUBE_FACE_TOP & mask)
        return make_vector( p1.x + (p2.x - p1.x) * (rd - p1.y) / (p2.y - p1.y),
                            rd,
                            p1.z + (p2.z - p1.z) * (rd - p1.y) / (p2.y - p1.y));
    
    if (CUBE_FACE_BOTTOM & mask)
        return make_vector( p1.x + (p2.x - p1.x) * (-rd - p1.y) / (p2.y - p1.y),
                            -rd,
                            p1.z + (p2.z - p1.z) * (-rd - p1.y) / (p2.y - p1.y));
    
    if (CUBE_FACE_FRONT & mask)
        return make_vector( p1.x + (p2.x - p1.x) * (rd - p1.z) / (p2.z - p1.z),
                            p1.y + (p2.y - p1.y) * (rd - p1.z) / (p2.z - p1.z),
                            rd);
    
    if (CUBE_FACE_BACK & mask)
        return make_vector( p1.x + (p2.x - p1.x) * (-rd - p1.z) / (p2.z - p1.z),
                            p1.y + (p2.y - p1.y) * (-rd - p1.z) / (p2.z - p1.z),
                            -rd);
    return p1;
}

Referenced by Octree::isHitByLine.

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