Created
November 10, 2015 00:25
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Calc normal given 3 points, python 3
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| import math | |
| def calcPlaneNormal(x1, y1, z1, x2, y2, z2, x3, y3, z3): | |
| nx1 = x1 - x2 | |
| ny1 = y1 - y2 | |
| nz1 = z1 - z2 | |
| mag1 = math.sqrt(nx1*nx1 + ny1*ny1 + nz1*nz1) | |
| nx2 = x1 - x3 | |
| ny2 = y1 - y3 | |
| nz2 = z1 - z3 | |
| mag2 = math.sqrt(nx2*nx2 + ny2*ny2 + nz2*nz2) | |
| nx1 = nx1 / mag1 | |
| ny1 = ny1 / mag1 | |
| nz1 = nz1 / mag1 | |
| nx2 = nx2 / mag2 | |
| ny2 = ny2 / mag2 | |
| nz2 = nz2 / mag2 | |
| cI = ny1*nz2 - nz1*ny2 | |
| cJ = nz1*nx2 - nx1*nz2 | |
| cK = nx1*ny2 - ny1*nx2 | |
| print(cI) | |
| print(cJ) | |
| print(cK) |
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