(Maya like) Camera errors (help)

OpenGL OpenGL: Basic Coding
1

I was trying to make a camera similar to Maya and having trouble with the rotation

The camera flips when looking down the yaxis, does a Z rotation when I only want x,y like maya
and when I translate and then rotate does some really funky things when not at the origin

Can anyone help me debug this?


if( Buttons[0] )
	{
		roty = -(float) 1.0f * diffx;
		rotx = -(float) 1.0f * diffy;	

		float phi = (rotx);
		float theta = (roty);


		glm::vec3 cameraW = glm::normalize(myCamera.getLookAtPosition()-myCamera.getCameraPosition());
		glm::vec3 cameraU = glm::normalize(glm::cross( myCamera.getupVector(), cameraW ) );

		glm::quat myQuat =   glm::normalize(glm::angleAxis(theta, glm::vec3(myCamera.getupVector().x, myCamera.getupVector().y, myCamera.getupVector().z))     *glm::angleAxis(phi, glm::vec3(cameraU.x, cameraU.y, cameraU.z))   );
		glm::mat4 rotmat = glm::toMat4( myQuat );

			
		glm::vec4 myPoint(myCamera.getCameraPosition().x,myCamera.getCameraPosition().y,myCamera.getCameraPosition().z,1.0f);
		glm::vec4 myVector(0.0, 1.0, 0.0, 0.0f);
		
		glm::vec4 newPosition = rotmat * myPoint;
		glm::vec4 newUpVector = myQuat* myVector ;//* glm::conjugate(glm::angleAxis(phi, glm::vec3(1.0f, 0.0f, 0.0f))) );



		myCamera.setCameraPosition(newPosition.x,newPosition.y,newPosition.z);
		myCamera.setupVector(newUpVector.x, newUpVector.y, newUpVector.z);


		myCamera.setViewMatrix(myCamera.getCameraPosition(),myCamera.getLookAtPosition(),myCamera.getupVector());
2

So this ended up working correctly as long as I do not translate

as so as I translate the camera, it spins and wobbles out of control…

any thoughts how to deal with rotation after the translation with this?


if( Buttons[0] )
	{
		roty = -(float) 1.5f * diffx;
		rotx = -(float) 1.5f * diffy;	

		float phi = (rotx);
		float theta = (roty);

		glm::vec3 cameraW = glm::normalize(myCamera.getLookAtPosition()-myCamera.getCameraPosition());
		glm::vec3 cameraU = glm::normalize(glm::cross( cameraW ,myCamera.getupVector()) );

		glm::quat myQuat = glm::normalize(glm::angleAxis(theta, glm::vec3(0.0f, 1.0f, 0.0f)) *  glm::angleAxis(phi, glm::vec3(cameraU.x, cameraU.y, cameraU.z)) );  //change back
		glm::mat4 rotmat = glm::toMat4( myQuat );

		glm::vec4 myPoint(myCamera.getCameraPosition().x,myCamera.getCameraPosition().y,myCamera.getCameraPosition().z,1.0f);
		glm::vec4 myVector(myCamera.getupVector().x, myCamera.getupVector().y, myCamera.getupVector().z, 0.0f);
		glm::vec4 newPosition = rotmat * myPoint;
		glm::vec4 newUpVector = rotmat * myVector;
		newUpVector = glm::normalize(newUpVector);


		myCamera.setCameraPosition(newPosition.x,newPosition.y,newPosition.z);
		myCamera.setupVector(newUpVector.x, newUpVector.y, newUpVector.z);


		myCamera.setViewMatrix(myCamera.getCameraPosition(),myCamera.getLookAtPosition(),myCamera.getupVector());