Why use glm::LookAt in OpenGL?
After reading on the coordinate systems in OpenGL, I figured to move the camera around the world I just need to translate the view coordinates. If I say use view = glm::translate(view, glm::vec3(0, 0, -50));, I'm translating the camera 50 units back (by translating the world 50 units forward). After thinking I had it figured out, I encounter LookAt function. I can't understand why I would need to use this function, if I just can move around my camera by translating and rotating the view. The whole thing is a bit hard to wrap the head around, so I'm sorry if this doesn't make much sense!
opengl coordinate-transformation glulookat
asked Dec 30 '18 at 4:54
John SmithJohn Smith
135
add a comment |
After reading on the coordinate systems in OpenGL, I figured to move the camera around the world I just need to translate the view coordinates. If I say use view = glm::translate(view, glm::vec3(0, 0, -50));, I'm translating the camera 50 units back (by translating the world 50 units forward). After thinking I had it figured out, I encounter LookAt function. I can't understand why I would need to use this function, if I just can move around my camera by translating and rotating the view. The whole thing is a bit hard to wrap the head around, so I'm sorry if this doesn't make much sense!
opengl coordinate-transformation glulookat
asked Dec 30 '18 at 4:54
John SmithJohn Smith
135
5
Who says that you need to use it? Your question seems like someone asking why they need to usestd::sort, since they can implement a quick-sort just fine themselves. And why do you think "I just can move around my camera by translating and rotating the view" is not literally what the function does?
– Nicol Bolas
Dec 30 '18 at 5:15
2
Nico is right you do not need to use it if you do not want to ... I code in OpenGL many years and still never usedLookAtnot the GLU nor the GLM version ... in fact I never used GLM (as I got my own math that predates GLM and suite my needs much better) and the only stuff I use from GLU isgluPerspectiveand lately not even that ... TheLookAtfunction is usually used by rookies as an shortcut for those they do not understand the matrix math preventing them from simple implementation of advanced camera stuff later on ...
– Spektre
Dec 30 '18 at 9:04
add a comment |
After reading on the coordinate systems in OpenGL, I figured to move the camera around the world I just need to translate the view coordinates. If I say use view = glm::translate(view, glm::vec3(0, 0, -50));, I'm translating the camera 50 units back (by translating the world 50 units forward). After thinking I had it figured out, I encounter LookAt function. I can't understand why I would need to use this function, if I just can move around my camera by translating and rotating the view. The whole thing is a bit hard to wrap the head around, so I'm sorry if this doesn't make much sense!
opengl coordinate-transformation glulookat
asked Dec 30 '18 at 4:54
John SmithJohn Smith
135
After reading on the coordinate systems in OpenGL, I figured to move the camera around the world I just need to translate the view coordinates. If I say use view = glm::translate(view, glm::vec3(0, 0, -50));, I'm translating the camera 50 units back (by translating the world 50 units forward). After thinking I had it figured out, I encounter LookAt function. I can't understand why I would need to use this function, if I just can move around my camera by translating and rotating the view. The whole thing is a bit hard to wrap the head around, so I'm sorry if this doesn't make much sense!
opengl coordinate-transformation glulookat
opengl coordinate-transformation glulookat
asked Dec 30 '18 at 4:54
John SmithJohn Smith
135
asked Dec 30 '18 at 4:54
John SmithJohn Smith
135
asked Dec 30 '18 at 4:54
John SmithJohn Smith
135
asked Dec 30 '18 at 4:54
John SmithJohn Smith
135
asked Dec 30 '18 at 4:54
John SmithJohn Smith
135
135
5
Who says that you need to use it? Your question seems like someone asking why they need to usestd::sort, since they can implement a quick-sort just fine themselves. And why do you think "I just can move around my camera by translating and rotating the view" is not literally what the function does?
– Nicol Bolas
Dec 30 '18 at 5:15
2
Nico is right you do not need to use it if you do not want to ... I code in OpenGL many years and still never usedLookAtnot the GLU nor the GLM version ... in fact I never used GLM (as I got my own math that predates GLM and suite my needs much better) and the only stuff I use from GLU isgluPerspectiveand lately not even that ... TheLookAtfunction is usually used by rookies as an shortcut for those they do not understand the matrix math preventing them from simple implementation of advanced camera stuff later on ...
– Spektre
Dec 30 '18 at 9:04
add a comment |
5
Who says that you need to use it? Your question seems like someone asking why they need to usestd::sort, since they can implement a quick-sort just fine themselves. And why do you think "I just can move around my camera by translating and rotating the view" is not literally what the function does?
– Nicol Bolas
Dec 30 '18 at 5:15
2
Nico is right you do not need to use it if you do not want to ... I code in OpenGL many years and still never usedLookAtnot the GLU nor the GLM version ... in fact I never used GLM (as I got my own math that predates GLM and suite my needs much better) and the only stuff I use from GLU isgluPerspectiveand lately not even that ... TheLookAtfunction is usually used by rookies as an shortcut for those they do not understand the matrix math preventing them from simple implementation of advanced camera stuff later on ...
– Spektre
Dec 30 '18 at 9:04
5
5
Who says that you need to use it? Your question seems like someone asking why they need to use
std::sort, since they can implement a quick-sort just fine themselves. And why do you think "I just can move around my camera by translating and rotating the view" is not literally what the function does?– Nicol Bolas
Dec 30 '18 at 5:15
Who says that you need to use it? Your question seems like someone asking why they need to use
std::sort, since they can implement a quick-sort just fine themselves. And why do you think "I just can move around my camera by translating and rotating the view" is not literally what the function does?– Nicol Bolas
Dec 30 '18 at 5:15
2
2
Nico is right you do not need to use it if you do not want to ... I code in OpenGL many years and still never used
LookAt not the GLU nor the GLM version ... in fact I never used GLM (as I got my own math that predates GLM and suite my needs much better) and the only stuff I use from GLU is gluPerspective and lately not even that ... The LookAt function is usually used by rookies as an shortcut for those they do not understand the matrix math preventing them from simple implementation of advanced camera stuff later on ...– Spektre
Dec 30 '18 at 9:04
Nico is right you do not need to use it if you do not want to ... I code in OpenGL many years and still never used
LookAt not the GLU nor the GLM version ... in fact I never used GLM (as I got my own math that predates GLM and suite my needs much better) and the only stuff I use from GLU is gluPerspective and lately not even that ... The LookAt function is usually used by rookies as an shortcut for those they do not understand the matrix math preventing them from simple implementation of advanced camera stuff later on ...– Spektre
Dec 30 '18 at 9:04
add a comment |
1 Answer
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glm::LookAt or mat4x4_look_at of linmath.h or gluLookAt, and so on, are all just there for your (= the programmer's) convenience. That's all.
If you want to setup the view portion of the modelview transform with a different method, because it suits you better, then by all means you should to that then.
answered Dec 30 '18 at 10:03
datenwolfdatenwolf
132k10132235
add a comment |
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1 Answer
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glm::LookAt or mat4x4_look_at of linmath.h or gluLookAt, and so on, are all just there for your (= the programmer's) convenience. That's all.
If you want to setup the view portion of the modelview transform with a different method, because it suits you better, then by all means you should to that then.
answered Dec 30 '18 at 10:03
datenwolfdatenwolf
132k10132235
add a comment |
glm::LookAt or mat4x4_look_at of linmath.h or gluLookAt, and so on, are all just there for your (= the programmer's) convenience. That's all.
If you want to setup the view portion of the modelview transform with a different method, because it suits you better, then by all means you should to that then.
answered Dec 30 '18 at 10:03
datenwolfdatenwolf
132k10132235
add a comment |
glm::LookAt or mat4x4_look_at of linmath.h or gluLookAt, and so on, are all just there for your (= the programmer's) convenience. That's all.
If you want to setup the view portion of the modelview transform with a different method, because it suits you better, then by all means you should to that then.
answered Dec 30 '18 at 10:03
datenwolfdatenwolf
132k10132235
glm::LookAt or mat4x4_look_at of linmath.h or gluLookAt, and so on, are all just there for your (= the programmer's) convenience. That's all.
If you want to setup the view portion of the modelview transform with a different method, because it suits you better, then by all means you should to that then.
answered Dec 30 '18 at 10:03
datenwolfdatenwolf
132k10132235
answered Dec 30 '18 at 10:03
datenwolfdatenwolf
132k10132235
answered Dec 30 '18 at 10:03
datenwolfdatenwolf
132k10132235
answered Dec 30 '18 at 10:03
datenwolfdatenwolf
132k10132235
132k10132235
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add a comment |
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5
Who says that you need to use it? Your question seems like someone asking why they need to use
std::sort, since they can implement a quick-sort just fine themselves. And why do you think "I just can move around my camera by translating and rotating the view" is not literally what the function does?– Nicol Bolas
Dec 30 '18 at 5:15
2
Nico is right you do not need to use it if you do not want to ... I code in OpenGL many years and still never used
LookAtnot the GLU nor the GLM version ... in fact I never used GLM (as I got my own math that predates GLM and suite my needs much better) and the only stuff I use from GLU isgluPerspectiveand lately not even that ... TheLookAtfunction is usually used by rookies as an shortcut for those they do not understand the matrix math preventing them from simple implementation of advanced camera stuff later on ...– Spektre
Dec 30 '18 at 9:04