50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
#include "common.h"
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void cam_point_dir(camera_t *model, float dx, float dy, float dz)
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{
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// Another case where I'd copy-paste code from my aimbot.
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// Except the last time I did it, I redid it from scratch,
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// and then dumped it. (VUW COMP308 Project 2012T2, anyone?)
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//
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// But yeah, basically this code's useful for making aimbots >:D
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//
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// Am I worried?
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// Well, the average skid is too lazy to compile this.
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// So, uh, no, not really.
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// Get two distance values.
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float d2 = dx*dx+dz*dz;
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float d3 = dy*dy+d2;
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// Square root them so they're actually distance values.
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d2 = sqrtf(d2);
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d3 = sqrtf(d3);
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// Get the normalised distances.
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float nx = dx/d3;
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float ny = dy/d3;
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float nz = dz/d3;
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// Now build that matrix!
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// Front vector (Z): Well, duh.
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model->mzx = nx;
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model->mzy = ny;
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model->mzz = nz;
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// Left (TODO: confirm) vector (X): Simple 2D 90deg rotation.
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// Can be derived from a bit of trial and error.
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model->mxx = dz/d2;
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model->mxy = 0.0f;
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model->mxz = -dx/d2;
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// Down vector (Y): STUPID GIMBAL LOCK GRR >:(
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// But really, this one's the hardest of them all.
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//
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// I decided to cheat and look at my aimbot anyway.
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// Still didn't *quite* solve my problem.
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model->myx = -dx*ny/d2;
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model->myy = sqrtf(1.0f - ny*ny);
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model->myz = -dz*ny/d2;
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}
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