diff options
Diffstat (limited to 'utils/hacks/TreeGraphs/Graphics/Geometry/mat3.py')
| -rw-r--r-- | utils/hacks/TreeGraphs/Graphics/Geometry/mat3.py | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/utils/hacks/TreeGraphs/Graphics/Geometry/mat3.py b/utils/hacks/TreeGraphs/Graphics/Geometry/mat3.py new file mode 100644 index 00000000..b8705a32 --- /dev/null +++ b/utils/hacks/TreeGraphs/Graphics/Geometry/mat3.py @@ -0,0 +1,40 @@ +import vec3,mat2
+
+def identity():
+ return ((1.0, 0.0, 0.0),
+ (0.0, 1.0, 0.0),
+ (0.0, 0.0, 1.0))
+
+def fromscale(scale):
+ x,y,z= scale
+ x,y,z= float(x),float(y),float(z)
+ return (( x, 0.0, 0.0),
+ (0.0, y, 0.0),
+ (0.0, 0.0, z))
+def fromscaleN(n):
+ return fromscale((n,n,n))
+
+def mul(a,b):
+ b_trans= zip(* b)
+ return tuple([transmulvec3(b_trans, a_r) for a_r in a])
+
+ # multiple vector v by a transposed matrix
+def transmulvec3(m_trans,v):
+ return tuple([vec3.dot(v, m_c) for m_c in m_trans])
+
+def mulvec3(m,v):
+ return transmulvec3(zip(* m), v)
+
+def mulN(m,N):
+ return tuple([vec3.mulN(v,N) for v in m])
+
+def det(m):
+ ((m00,m01,m02),
+ (m10,m11,m12),
+ (m20,m21,m22))= m
+
+ a= m00 * mat2.det( ((m11, m12), (m21, m22)) );
+ b= m10 * mat2.det( ((m01, m02), (m21, m22)) );
+ c= m20 * mat2.det( ((m01, m02), (m11, m12)) );
+
+ return a-b+c
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