| Poster | : djmulder | | Posts | : 33 | | Country | : | | City | : |
| | | | Posted by djmulder on 07/02/2008 at 03:30:52
| | Hi riemer,
Long time no see, I've been busy ;)
I finaly managed to find the time to read up on matrices in your tutorial. But the homogenous one confuses me.
I understand the basic concept but I think you missed one step:
- Why did you chose the constant "1"?
- Looking at the first translation matrix, I understand it's basicly a scaling matrix with s set to 1, but is S=1 the same "1" as the constant? or am I wrong to assume this?
Kind regards,
DJM | |
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| Poster | : djmulder | | Posts | : 33 | | Country | : | | City | : |
| | | | Posted by djmulder on 07/02/2008 at 04:55:06
| | | oops offcourse I mean homogenous :) | |
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| Poster | : Archenon | | Posts | : 428 | | Country | : Romania | | City | : Oradea |
| | | | Posted by Archenon on 04/06/2008 at 05:07:12
| | Hy sorry for the late rsponse but i think the value 1 was chosen because it doesn't effect a multiplication in any way. A matrix which has on the primary diagonal only values of 1 is called the Identity matrix because if you multiply it with any matrix A you get A as a result.
The first 3 values on the diagonal plays role in the transformation but the 4th doesn't need to effect it in any way. It was putten there to make the matrice 4x4.
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| Poster | : riemer | | Posts | : 1392 | | Country | : Belgium | | City | : Antwerp |
| | | | Posted by riemer on 04/06/2008 at 14:43:25
| | hey dj sorry for not having responded to your question back in february, I was quite busy at that time ;)
Archenon is completely right, you have to put a 1 there so this has no impact. Keep in mind that the 4th coordinate has absolutely no physical meaning, we just need one so we can have matrices that contain translations. | |
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| Poster | : Anonymous | | Posts | : | | Country | : | | City | : |
| | | | Posted by Anonymous on 27/11/2010 at 16:38:36
| | Hi Riemer,
Great tutorial series. However in these matrix series I don't get the point of using a matrix for a translation. It's possible to just add the x, y and z parts.
or do I miss something? | |
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