diff options
Diffstat (limited to 'libdimension/dimension/geometry.h')
| -rw-r--r-- | libdimension/dimension/geometry.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/libdimension/dimension/geometry.h b/libdimension/dimension/geometry.h index 68359aa..3011216 100644 --- a/libdimension/dimension/geometry.h +++ b/libdimension/dimension/geometry.h @@ -39,6 +39,12 @@ typedef struct { dmnsn_vector n; /* A normal vector; the direction of the line */ } dmnsn_line; +/* Vector constants */ +static const dmnsn_vector dmnsn_zero = { 0.0, 0.0, 0.0 }; +static const dmnsn_vector dmnsn_x = { 1.0, 0.0, 0.0 }; +static const dmnsn_vector dmnsn_y = { 0.0, 1.0, 0.0 }; +static const dmnsn_vector dmnsn_z = { 0.0, 0.0, 1.0 }; + /* Shorthand for vector/matrix construction */ DMNSN_INLINE dmnsn_vector @@ -133,6 +139,13 @@ dmnsn_vector_cross(dmnsn_vector lhs, dmnsn_vector rhs) return v; } +DMNSN_INLINE dmnsn_vector +dmnsn_vector_proj(dmnsn_vector u, dmnsn_vector d) +{ + /* 1 division, 9 multiplications, 4 additions */ + return dmnsn_vector_mul(dmnsn_vector_dot(u, d)/dmnsn_vector_dot(d, d), d); +} + DMNSN_INLINE double dmnsn_vector_norm(dmnsn_vector n) { @@ -147,6 +160,9 @@ dmnsn_vector_normalize(dmnsn_vector n) return dmnsn_vector_div(n, dmnsn_vector_norm(n)); } +double dmnsn_vector_axis_angle(dmnsn_vector v1, dmnsn_vector v2, + dmnsn_vector axis); + dmnsn_matrix dmnsn_matrix_inverse(dmnsn_matrix A); dmnsn_matrix dmnsn_matrix_mul(dmnsn_matrix lhs, dmnsn_matrix rhs); dmnsn_vector dmnsn_matrix_vector_mul(dmnsn_matrix lhs, dmnsn_vector rhs); |