Topic: i dont understand rotation matrix

+Anonymous A — 4.9 years ago #58,723

basically if i rotate the camera by 90 degree in x axis, what do matrix do?

+Anonymous B — 4.9 years ago, 4 hours later[T] [B] #607,147

On your diagram, P is a point with coordinates (x, y, 0). If you rotate the camera 90 degrees around the x axis, effectively the x coord stays the same, y becomes zero and z becomes the value of y. (If you can't visualise this then spend a bit more time on it and draw some more diagrams until you do).

The rotation matrix is simply what you multiply (x, y, 0) by to get (x, 0, y), which would be:

| 1, 0, 0 |
| 0, cos 90, -sin 90 |
| 0, sin 90, cos 90 |

=

| 1, 0, 0 |
| 0, 0, -1 |
| 0, 1, 0 |

·Anonymous A (OP) — 4.9 years ago, 21 hours later, 1 day after the original post[T] [B] #607,223

@previous (B)
kan you explain abt this matrix and why do you multiply them?

·Anonymous B — 4.9 years ago, 1 hour later, 1 day after the original post[T] [B] #607,226

@previous (A)
Watch this: https://youtube.com/watch?v=kjBOesZCoqc

Then watch all 10 following videos in the series, in order. If you still don't understand after that then I can't help you.

·Anonymous A (OP) — 4.9 years ago, 5 hours later, 1 day after the original post[T] [B] #607,233

@previous (B) yeah no they dont exactly explain why each of the matrix do what they do.

what do you understand of it then?

·Anonymous B — 4.9 years ago, 7 hours later, 1 day after the original post[T] [B] #607,248

@previous (A)
> yeah no they dont exactly explain why each of the matrix do what they do.
Sorry, but you can't have watched all the videos then. Vectors, matrices & transformations are explained perfectly. I can't recommend anything better than this. Either you are not trying hard enough or you are too stupid.

> what do you understand of it then?
I understand everything about transformation matrices... which is why I know those videos are gold.

+Anonymous C — 4.9 years ago, 5 hours later, 1 day after the original post[T] [B] #607,279

@previous (B)
i know vectors. i just dont get the gist of matrix and transformation.
> i understand everything
then can you explain them in your own words then

or just point out your favorite explanations from those videos

+Anonymous D — 4.9 years ago, 1 minute later, 1 day after the original post[T] [B] #607,282

This thread...is a Fag thread.

·Anonymous C — 4.9 years ago, 1 hour later, 1 day after the original post[T] [B] #607,293

@previous (D)
if everyone toldya your grass is not green, then believing otherwise, is just nuts isnt it?

or, really, arent you colorblind?

·Anonymous B — 4.9 years ago, 2 hours later, 2 days after the original post[T] [B] #607,298

@607,282 (D)
> This thread...is a Fag thread.
Well it is now that you fagged it up. Thanks, fag.

·Anonymous B — 4.9 years ago, 1 minute later, 2 days after the original post[T] [B] #607,299

@607,279 (C)
> i know vectors. i just dont get the gist of matrix and transformation.
> > i understand everything
> then can you explain them in your own words then
>
> or just point out your favorite explanations from those videos
No. You have to watch all of them, in order. Make more of an effort.

·Anonymous C — 4.9 years ago, 1 hour later, 2 days after the original post[T] [B] #607,302

@previous (B) i have seen them. usually i understood vector math just by reading a single unity tutorial.

now could you please explain something useful or please just scram?

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