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trimmed comment and thanks
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edit approved Jun 19, 2018 at 2:13
meetar
edit approved Jun 19, 2018 at 2:13
meetar
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I came across this tutorial on how to create a movable camera in OpenGL using glm::lookAt(glm::vec3 position, glm::vec3 target, glm::vec3 up). In the tutorial, in order to keep the camera always facing in one direction while moving, the view matrix is created as such: view = glm::lookAt(cameraPos, cameraPos + cameraFront, cameraUp);, where cameraPos, cameraFront, and cameraUp are all glm::vec3 type.

What I would like to ask is why does the second argument have to be cameraPos + cameraFront? If the camera position moved to the right without changing cameraFront, wouldn't cameraPos + cameraFront have an effect of rotating to the right as opposed to staying in the same direction (which I think is what should be needed(?)? Any help is appreciated. Thanks!

I came across this tutorial on how to create a movable camera in OpenGL using glm::lookAt(glm::vec3 position, glm::vec3 target, glm::vec3 up). In the tutorial, in order to keep the camera always facing in one direction while moving, the view matrix is created as such: view = glm::lookAt(cameraPos, cameraPos + cameraFront, cameraUp);, where cameraPos, cameraFront, and cameraUp are all glm::vec3 type.

What I would like to ask is why does the second argument have to be cameraPos + cameraFront? If the camera position moved to the right without changing cameraFront, wouldn't cameraPos + cameraFront have an effect of rotating to the right as opposed to staying in the same direction (which I think is what should be needed(?)? Any help is appreciated. Thanks!

I came across this tutorial on how to create a movable camera in OpenGL using glm::lookAt(glm::vec3 position, glm::vec3 target, glm::vec3 up). In the tutorial, in order to keep the camera always facing in one direction while moving, the view matrix is created as such: view = glm::lookAt(cameraPos, cameraPos + cameraFront, cameraUp);, where cameraPos, cameraFront, and cameraUp are all glm::vec3 type.

What I would like to ask is why does the second argument have to be cameraPos + cameraFront? If the camera position moved to the right without changing cameraFront, wouldn't cameraPos + cameraFront have an effect of rotating to the right as opposed to staying in the same direction (which I think is what should be needed)?

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Tony Tarng
Tony Tarng
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Creating a movable camera using glm::lookAt()

I came across this tutorial on how to create a movable camera in OpenGL using glm::lookAt(glm::vec3 position, glm::vec3 target, glm::vec3 up). In the tutorial, in order to keep the camera always facing in one direction while moving, the view matrix is created as such: view = glm::lookAt(cameraPos, cameraPos + cameraFront, cameraUp);, where cameraPos, cameraFront, and cameraUp are all glm::vec3 type.

What I would like to ask is why does the second argument have to be cameraPos + cameraFront? If the camera position moved to the right without changing cameraFront, wouldn't cameraPos + cameraFront have an effect of rotating to the right as opposed to staying in the same direction (which I think is what should be needed(?)? Any help is appreciated. Thanks!