math - Getting a vector coordinate post matrix multiplication -


i have series of transformations take object , put somewhere else. manually multiplying these transformations programmable pipeline in gl/es. i'm rotating around distant arbitrary points , translating, , while have no trouble getting object position want it, i'd know how can extract final 3d vector coordinate of position after these transformations.?

one option, suggested this question, multiply starting position final matrix , keep result vector final coordinate. if so, vector use represent object's origin before these transformations? because multiplying matrix origin (0,0,0) results in vector of zeroes.

the solution surprisingly simple.

if have matrix m final transformation created matrix multiplications, can find center of object transformed m simply:

m * vector(0,0,0,1) // creates 4d vector, first three, x,y,z coordinates

this done manually in code.

the key piece question missing exact vector use multiplication.


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