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Crystal Ball Interface --> FPS

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I currently have a crystal ball interface camera set-up where the camera is always looking at the origin and pressing left,right,up,down simply moves around the object.

I want to change this so that the camera can move around freely around the 3D environment.

I currently have two functions, LEFT and UP that have been implemented as the CB-interface I mentioned.

I want the left and right key to strafe left/right, while up/down to rise and sink the camera. How exactly would I go about changing it?

Also..what would be the proper way to move the camera forward and backward? I was thinking maybe draging the mouse could equate to moving foward/backward?


void Transform::left(float degrees, vec3& eye, vec3& up) {
eye = eye*rotate(degrees, up);

void Transform::up(float degrees, vec3& eye, vec3& up) {
vec3 ortho_axis = glm::cross(eye, up);
ortho_axis = glm::normalize(ortho_axis);

eye = eye*rotate(degrees, ortho_axis);
up = up*rotate(degrees, ortho_axis);

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