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05-23-18 12:22 PM |
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0 users reading Need help converting triangle formats! | 1 bot |
Main - Misc. ROM hacking - Need help converting triangle formats! | New reply |
Yoshimaster96 |
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Member Normal user Level: 33 Posts: 93/338 EXP: 223781 Next: 5398 Since: 11-03-14 Last post: 80 days ago Last view: 2 days ago |
GMA files store the vertices of a triangle as 3 XYZ coordinates. But for collision, LZ files store the vertices as follows:
Posted by LZ.TXT For clarification, first coordinate is (x1,y1,z1), second coordinate is calculated as (x1+dx2x1,y1+dy2y1,z1), rotated about first point by x angle, y angle, and z angle, in the order specified above. Third coordinate is calculated similarly, from (x1+dx3x1,y1+dy3y1,z1), rotated by the same angles. The ?s are unknown, but I think they're tangent and bitangent/binormal. So how would I convert from GMA triangle to LZ triangle? |
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Normal user Level: 24 Posts: 125/129 EXP: 67859 Next: 10265 Since: 07-08-12 Last post: 1178 days ago Last view: 150 days ago |
This is python code that converts a triangle given by the vertices a, b and c:
Here v0 and v1 corresponds to your (dx2x1,dy2y1) and (dx3x1,dy3y1) and n0 and n1 corresponds to your unknowns. Also, have you noticed that the collision is divided into a grid? |
Yoshimaster96 |
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Member Normal user Level: 33 Posts: 103/338 EXP: 223781 Next: 5398 Since: 11-03-14 Last post: 80 days ago Last view: 2 days ago |
Posted by blank Tried to convert this to C# (as that is the language of my program), but I got stuck. How are cx, cy, cz, sx, sy, and sz defined? |
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Normal user Level: 24 Posts: 126/129 EXP: 67859 Next: 10265 Since: 07-08-12 Last post: 1178 days ago Last view: 150 days ago |
cx, sx, cy, sy, cz and sz are floats and are the cosine and sine of the rotation angles. |
Yoshimaster96 |
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Member Normal user Level: 33 Posts: 105/338 EXP: 223781 Next: 5398 Since: 11-03-14 Last post: 80 days ago Last view: 2 days ago |
Posted by blankThose aren't given however. I'm trying to find the rotation angles. |
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Normal user Level: 24 Posts: 127/129 EXP: 67859 Next: 10265 Since: 07-08-12 Last post: 1178 days ago Last view: 150 days ago |
You calculate the angles using cx, sx, etc. In my code snippet this is done with the reverse_angle function. |
Yoshimaster96 |
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Member Normal user Level: 33 Posts: 106/338 EXP: 223781 Next: 5398 Since: 11-03-14 Last post: 80 days ago Last view: 2 days ago |
You don't get it? I'm given coordinates, and am trying to find angles. I can't find sine and cosine of angles I don't know. |
Kinnay |
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Member Normal user Level: 16 Posts: 7/66 EXP: 18776 Next: 1480 Since: 01-13-15 From: Netherlands / Germany Last post: 1023 days ago Last view: 987 days ago |
Hmm, not sure if that's what you meant, but you can find angles in a triangle if you know the length of the sides with the cosine rule. You can easily calculate the lengths of the sides if you know the coordinates. |
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Normal user Level: 24 Posts: 128/129 EXP: 67859 Next: 10265 Since: 07-08-12 Last post: 1178 days ago Last view: 150 days ago |
The code specifically shows how to calculate cx, sx, etc. without first calculating the angles. |
Main - Misc. ROM hacking - Need help converting triangle formats! | New reply |
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