Overrides - Further work on camera data

It *should* be ready to be used with the overrides system now.

camera.cc

@@ -2,6 +2,8 @@
 #include "camera.hh"
 #include "utilities.hh"
 
+#include <glm/gtc/matrix_access.hpp>
+
 
 /*= T_Camera =================================================================*/
 
@@ -13,6 +15,28 @@ T_Camera::T_Camera( ) noexcept
 
 /*----------------------------------------------------------------------------*/
 
+void T_Camera::camera(
+		glm::vec3 const& lookAt ,
+		glm::vec3 const& angles ,
+		const float distance ) noexcept
+{
+	lookAt_ = lookAt;
+	angles_ = angles;
+	distance_ = distance;
+	cvtAnglesToVectors( );
+}
+
+void T_Camera::camera(
+		glm::vec3 const& position ,
+		glm::vec3 const& target ,
+		glm::vec3 const& up ) noexcept
+{
+	pos_ = position;
+	up_ = up;
+	lookAt_ = target;
+	cvtVectorsToAngles( );
+}
+
 void T_Camera::cvtAnglesToVectors( ) noexcept
 {
 	anglesToMatrix( &angles_.x , &rotMat_[ 0 ].x );
@@ -23,7 +47,31 @@ void T_Camera::cvtAnglesToVectors( ) noexcept
 
 void T_Camera::cvtVectorsToAngles( ) noexcept
 {
-#warning implement the fuck
+	dir_ = lookAt_ - pos_;
+	distance_ = dir_.length( );
+	if ( distance_ == 0 ) {
+		angles_ = glm::vec3( 0 );
+		return;
+	}
+
+	const glm::vec3 nDir{ - dir_ / distance_ };
+	const glm::vec3 side{ normalize( cross( normalize( up_ ) , nDir ) ) };
+	const glm::vec3 up{ normalize( cross( nDir , side ) ) };
+	column( rotMat_ , 0 ) = side;
+	column( rotMat_ , 1 ) = up;
+	column( rotMat_ , 2 ) = nDir;
+
+	glm::vec3 nAngles;
+	nAngles.x = atan2f( nDir.y , nDir.z );
+
+	const float c2{ sqrtf( side.x * side.x + side.y * side.y ) };
+	nAngles.y = atan2f( -side.z , c2 );
+
+	const float s1{ sinf( nAngles.x ) } , c1{ cosf( nAngles.x ) };
+	nAngles.z = atan2f( s1 * nDir.x - c1 * up.x ,
+			c1 * up.y - s1 * nDir.y );
+
+	angles_ = nAngles * 360.f / float( M_PI );
 }
 
 /*------------------------------------------------------------------------------*/
@@ -76,9 +124,6 @@ void T_Camera::handleWheel(
 void T_Camera::makeUI( ) noexcept
 {
 	using namespace ImGui;
-	if ( !CollapsingHeader( "Camera" ) ) {
-		return;
-	}
 
 	const bool changed[] = {
 		DragFloat3( "Target" , &lookAt_.x ) ,

camera.hh

@@ -63,7 +63,7 @@ struct T_Camera
 			glm::vec3 const& angles ,
 			float distance ) noexcept;
 	void camera( glm::vec3 const& position ,
-			glm::vec3 const& direction ,
+			glm::vec3 const& directionOrTarget ,
 			glm::vec3 const& up ) noexcept;
 
     private: