Added billboard support for RenderablePlane

include/openspace/rendering/renderableplane.h

@@ -59,6 +59,7 @@ private:
 	void loadTexture();
 
 	properties::StringProperty _texturePath;
+	properties::BoolProperty _billboard;
 
 	glm::vec2 _size;
 	Origin _origin;

src/rendering/renderableplane.cpp

@@ -47,6 +47,7 @@ namespace openspace {
 RenderablePlane::RenderablePlane(const ghoul::Dictionary& dictionary)
 	: Renderable(dictionary)
 	, _texturePath("texture", "Texture")
+	, _billboard("billboard", "Billboard", false)
 	, _size(glm::vec2(1,1))
 	, _origin(Origin::Center)
 	, _shader(nullptr)
@@ -75,6 +76,12 @@ RenderablePlane::RenderablePlane(const ghoul::Dictionary& dictionary)
 		}
 	}
 
+	// Attempt to get the billboard value
+	bool billboard = false;
+	if (dictionary.getValue("Billboard", billboard)) {
+		_billboard = billboard;
+	}
+
 	std::string texturePath = "";
 	bool success = dictionary.getValue("Texture", texturePath);
 	if (success)
@@ -146,6 +153,8 @@ void RenderablePlane::render(const RenderData& data) {
 		return;
 
 	glm::mat4 transform = glm::mat4(1.0);
+	if (_billboard)
+		transform = glm::inverse(data.camera.viewRotationMatrix());
 	//transform = glm::scale(transform, glm::vec3(0.01));
 
 	// Activate shader