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- /**** Decompose.h - Basic declarations ****/
- #ifndef _H_Decompose
- #define _H_Decompose
- typedef struct {float x, y, z, w;} Quat; /* Quaternion */
- enum QuatPart {X, Y, Z, W};
- typedef Quat HVect; /* Homogeneous 3D vector */
- typedef float HMatrix[4][4]; /* Right-handed, for column vectors */
- typedef struct {
- HVect t; /* Translation components */
- Quat q; /* Essential rotation */
- Quat u; /* Stretch rotation */
- HVect k; /* Stretch factors */
- float f; /* Sign of determinant */
- } AffineParts;
- float polar_decomp(HMatrix M, HMatrix Q, HMatrix S);
- HVect spect_decomp(HMatrix S, HMatrix U);
- Quat snuggle(Quat q, HVect *k);
- void decomp_affine(HMatrix A, AffineParts *parts);
- void invert_affine(AffineParts *parts, AffineParts *inverse);
- #endif
-