First person camera and matrix transforms

Mr. Poopy Pants · 2013-02-08T04:56:24

Well that's pretty much it. I've been trying to find a resource on how to implement a 1rst person camera in OpenGL (particulary 3.3, using LWJGL bindings for Java) and I always find things that either: a. Use deprecated functions or things that depend on deprecated functions (gluLookAt) or b. Rely on some third party library that isn't available on Java (ie, GLM) Currently I just have "working" the perspective projection, translations and rotations along a single arbitrary vector (taken from http://en.wikipedia.org/wiki/Rotation_matrix, "Rotation matrix from axis and angle"). The rotation I coded is plain archaic, press a to look to the left, d to the right, z up, x down, etc. And I can't figure out how to make them "stack" properly so its either look to the sides or up and down. Adding to that, I'm kinda confused on how many space transformations do I need for some things. For example, say that I load a model. I have to put it in world space first, what would involve? I imagine translation, scaling and rotation. That would be my "model to world" transform i guess. Then I have to transform that to view space. And that's where the first person camera kicks in and when I get lost. I've seen examples using matrix stacks (either the deprecated ones or the implementation of GLM) and I can't figure out how those work nor if there is a better way than using them (I guess they got deprecated for a reason?), so I didn't understand those either. So what do I need to get a camera working? And which transforms differentiate one space from another? If you wan't me to post code or upload the jar to see the issues I'm having just ask.

For Beginners

Started by TheChubu January 29, 2013 06:18 PM

19 comments, last by Trienco 11 years, 2 months ago

Trienco

2,555

February 08, 2013 04:56 AM

Unless you somewhere normalize your forward and right vector, you are going to move veeeeeeery slowly while looking up (and not diving by 0 is then another reason to limit up/down rotation to less than 90°).

f@dzhttp://festini.device-zero.de

First person camera and matrix transforms

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First person camera and matrix transforms

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