OPC_TriTriOverlap.h File Reference

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Macros
#define	EDGE_AGAINST_TRI_EDGES(V0, V1, U0, U1, U2)
	TO BE DOCUMENTED. More...
#define	EDGE_EDGE_TEST(V0, U0, U1)
	Edge to edge test based on Franlin Antonio's gem: "Faster Line Segment Intersection", in Graphics Gems III, pp. 199-202. More...
#define	LOCAL_EPSILON   0.000001f
	if OPC_TRITRI_EPSILON_TEST is true then we do a check (if |dv|<EPSILON then dv=0.0;) else no check is done (which is less robust, but faster) More...
#define	NEWCOMPUTE_INTERVALS(VV0, VV1, VV2, D0, D1, D2, D0D1, D0D2, A, B, C, X0, X1)
	TO BE DOCUMENTED. More...
#define	POINT_IN_TRI(V0, U0, U1, U2)
	TO BE DOCUMENTED. More...
#define	SORT(a, b)
	sort so that a<=b More...

Functions
BOOL	CoplanarTriTri (const Point &n, const Point &v0, const Point &v1, const Point &v2, const Point &u0, const Point &u1, const Point &u2)
	TO BE DOCUMENTED. More...

Macro Definition Documentation

EDGE_AGAINST_TRI_EDGES

#define EDGE_AGAINST_TRI_EDGES	(		V0,
			V1,
			U0,
			U1,
			U2
	)

Value:

{                                                                                                               \
        float Bx,By,Cx,Cy,d,f;                                                          \
        const float Ax = V1[i0] - V0[i0];                                       \
        const float Ay = V1[i1] - V0[i1];                                       \
        /* test edge U0,U1 against V0,V1 */                                     \
        EDGE_EDGE_TEST(V0, U0, U1);                                                     \
        /* test edge U1,U2 against V0,V1 */                                     \
        EDGE_EDGE_TEST(V0, U1, U2);                                                     \
        /* test edge U2,U1 against V0,V1 */                                     \
        EDGE_EDGE_TEST(V0, U2, U0);                                                     \
}

TO BE DOCUMENTED.

Definition at line 36 of file OPC_TriTriOverlap.h.

EDGE_EDGE_TEST

#define EDGE_EDGE_TEST	(		V0,
			U0,
			U1
	)

Value:

        Bx = U0[i0] - U1[i0];                                                           \
        By = U0[i1] - U1[i1];                                                           \
        Cx = V0[i0] - U0[i0];                                                           \
        Cy = V0[i1] - U0[i1];                                                           \
        f  = Ay*Bx - Ax*By;                                                                     \
        d  = By*Cx - Bx*Cy;                                                                     \
        if((f>0.0f && d>=0.0f && d<=f) || (f<0.0f && d<=0.0f && d>=f))  \
        {                                                                                                       \
                const float e=Ax*Cy - Ay*Cx;                                    \
                if(f>0.0f)                                                                              \
                {                                                                                               \
                        if(e>=0.0f && e<=f) return TRUE;                        \
                }                                                                                               \
                else                                                                                    \
                {                                                                                               \
                        if(e<=0.0f && e>=f) return TRUE;                        \
                }                                                                                               \
        }

Edge to edge test based on Franlin Antonio's gem: "Faster Line Segment Intersection", in Graphics Gems III, pp. 199-202.

Definition at line 15 of file OPC_TriTriOverlap.h.

LOCAL_EPSILON

#define LOCAL_EPSILON   0.000001f

if OPC_TRITRI_EPSILON_TEST is true then we do a check (if |dv|<EPSILON then dv=0.0;) else no check is done (which is less robust, but faster)

Definition at line 3 of file OPC_TriTriOverlap.h.

NEWCOMPUTE_INTERVALS

#define NEWCOMPUTE_INTERVALS	(		VV0,
			VV1,
			VV2,
			D0,
			D1,
			D2,
			D0D1,
			D0D2,
			A,
			B,
			C,
			X0,
			X1
	)

TO BE DOCUMENTED.

Definition at line 124 of file OPC_TriTriOverlap.h.

POINT_IN_TRI

#define POINT_IN_TRI	(		V0,
			U0,
			U1,
			U2
	)

Value:

{                                                                                                               \
        /* is T1 completly inside T2? */                                        \
        /* check if V0 is inside tri(U0,U1,U2) */                       \
        float a  = U1[i1] - U0[i1];                                                     \
        float b  = -(U1[i0] - U0[i0]);                                          \
        float c  = -a*U0[i0] - b*U0[i1];                                        \
        float d0 = a*V0[i0] + b*V0[i1] + c;                                     \
                                                                                                                \
        a  = U2[i1] - U1[i1];                                                           \
        b  = -(U2[i0] - U1[i0]);                                                        \
        c  = -a*U1[i0] - b*U1[i1];                                                      \
        const float d1 = a*V0[i0] + b*V0[i1] + c;                       \
                                                                                                                \
        a  = U0[i1] - U2[i1];                                                           \
        b  = -(U0[i0] - U2[i0]);                                                        \
        c  = -a*U2[i0] - b*U2[i1];                                                      \
        const float d2 = a*V0[i0] + b*V0[i1] + c;                       \
        if(d0*d1>0.0f)                                                                          \
        {                                                                                                       \
                if(d0*d2>0.0f) return TRUE;                                             \
        }                                                                                                       \
}

TO BE DOCUMENTED.

Definition at line 50 of file OPC_TriTriOverlap.h.

SORT

#define SORT	(		a,
			b
	)

Value:

        if(a>b)                                 \
        {                                               \
                const float c=a;        \
                a=b;                            \
                b=c;                            \
        }

sort so that a<=b

Definition at line 6 of file OPC_TriTriOverlap.h.

Function Documentation

CoplanarTriTri()

BOOL CoplanarTriTri	(	const Point &	n,
		const Point &	v0,
		const Point &	v1,
		const Point &	v2,
		const Point &	u0,
		const Point &	u1,
		const Point &	u2
	)

TO BE DOCUMENTED.

Definition at line 75 of file OPC_TriTriOverlap.h.