Background test

src/dawn/display/Transform.cpp

@@ -5,6 +5,7 @@
 
 #include "Transform.hpp"
 #include "scene/SceneItem.hpp"
+#include "util/mathutils.hpp"
 
 using namespace Dawn;
 
@@ -69,6 +70,16 @@ void Transform::lookAt(glm::vec3 pos, glm::vec3 look, glm::vec3 up) {
   this->setWorldTransform(glm::lookAt(pos, look, up));
 }
 
+float_t Transform::lookAtPixelPerfect(
+  glm::vec3 position, glm::vec3 look, float_t viewportHeight, float_t fov
+) {
+  float_t z = (
+    tanf((mathDeg2Rad(180.0f) - fov) / 2.0f) *
+    (viewportHeight/2.0f)
+  );
+  this->lookAt(glm::vec3(position.x, position.y, position.z + z), look);
+  return z;
+}
 
 glm::vec3 Transform::getLocalPosition() {
   return this->localPosition;