c++ - Camera/View matrix -


after reading through article (http://3dgep.com/?p=1700) seems imply got view matrix wrong. here's how compute view matrix;

mat4 camera::orientation() const {     quaternion rotation;     rotation = glm::angleaxis(mverticalangle, vec3(1.0f, 0.0f, 0.0f));     rotation = rotation * glm::angleaxis(mhorizontalangle, vec3(0.0f, 1.0f, 0.0f));      return glm::tomat4(rotation); }   mat4 camera::getviewmatrix() const {     return orientation() * glm::translate(mat4(1.0f), -mtranslation);  }

supposedly, invert resulting matrix, have not far , has work excellently far, , i'm not doing inverting down pipeline either. there missing here?

you did inversion. view matrix inverse of model transformation positions camera. is:

modelcamera = translation(position) * rotation

so inverse is:

viewmatrix = (translation(position) * rotation)^-1            = rotation^-1 * translation(position)^-1

the translation inverted negating offset:

           = rotation^-1 * translation(-position)

this leaves inverting rotation. can assume rotation inverted. thus, original rotation of camera model is

rotation^-1 = rotationx(verticalangle) * rotationy(horizontalangle) rotation    = (rotationx(verticalangle) * rotationy(horizontalangle))^-1             = rotationy(horizontalangle)^-1 * rotationx(verticalangle)^-1             = rotationy(-horizontalangle) * rotationx(-verticalangle)

so angles specify inverted angles rotate camera. if increase horizontalangle, camera should turn right (assuming right-handed coordinate system). that's matter of definitions.


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