add --projection=ortho|perspective option to cmdline

src/Camera.h

@@ -12,6 +12,8 @@ There are two different types of cameras represented in this class:
 *Gimbal camera - uses Euler Angles, object translation, and viewer distance
 *Vector camera - uses 'eye', 'center', and 'up' vectors ('lookat' style)
 
+There are two modes of projection, Perspective and Orthogonal.
+
 */
 
 #include <vector>
@@ -21,8 +23,10 @@ class Camera
 {
 public:
 	enum CameraType { NONE, GIMBAL, VECTOR } type;
+	enum ProjectionType { ORTHOGONAL, PERSPECTIVE } projection;
 	Camera() {
 		type = Camera::NONE;
+		projection = Camera::PERSPECTIVE;
 	}
 	Camera( enum CameraType e )
 	{
@@ -38,6 +42,7 @@ public:
 		}
 		pixel_width = 512;
 		pixel_height = 512;
+		projection = Camera::PERSPECTIVE;
 	}
 
 	void setup( std::vector<double> params ) {

src/GLView.cc

@@ -13,11 +13,10 @@ GLView::GLView()
 {
   showedges = false;
   showfaces = true;
-  orthomode = false;
   showaxes = false;
   showcrosshairs = false;
 	renderer = NULL;
-	cam.type = Camera::NONE;
+	cam = Camera();
 #ifdef ENABLE_OPENCSG
   is_opencsg_capable = false;
   has_shaders = false;
@@ -281,7 +280,7 @@ void GLView::vectorCamPaintGL()
 {
   glEnable(GL_LIGHTING);
 
-  if (orthomode) setupVectorCamOrtho();
+  if (cam.projection==Camera::ORTHOGONAL) setupVectorCamOrtho();
   else setupVectorCamPerspective();
 
   glMatrixMode(GL_MODELVIEW);
@@ -318,8 +317,10 @@ void GLView::gimbalCamPaintGL()
 {
   glEnable(GL_LIGHTING);
 
-  if (orthomode) GLView::setupGimbalCamOrtho(cam.viewer_distance);
-  else GLView::setupGimbalCamPerspective();
+  if (cam.projection == Camera::ORTHOGONAL)
+		GLView::setupGimbalCamOrtho(cam.viewer_distance);
+  else
+		GLView::setupGimbalCamPerspective();
 
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
@@ -430,7 +431,7 @@ void GLView::showSmallaxes()
   glEnd();
 
   //Restore perspective for next paint
-  if(!orthomode)
+  if(cam.projection==Camera::PERSPECTIVE)
     GLView::setupGimbalCamPerspective();
 }
 

src/QGLView.h

@@ -34,8 +34,11 @@ public:
 	void setShowAxes(bool enabled) { this->showaxes = enabled; }
 	bool showCrosshairs() const { return this->showcrosshairs; }
 	void setShowCrosshairs(bool enabled) { this->showcrosshairs = enabled; }
-	bool orthoMode() const { return this->orthomode; }
-	void setOrthoMode(bool enabled) { this->orthomode = enabled; }
+	bool orthoMode() const { return (this->cam.projection == Camera::ORTHOGONAL); }
+	void setOrthoMode(bool enabled) {
+		if (enabled) this->cam.projection = Camera::ORTHOGONAL;
+		else this->cam.projection = Camera::PERSPECTIVE;
+	}
 	std::string getRendererInfo() const;
 	bool save(const char *filename);
 

src/openscad.cc

@@ -78,7 +78,7 @@ static void help(const char *progname)
 	fprintf(stderr,"Usage: %s [ -o output_file [ -d deps_file ] ]\\\n"
 	        "%*s[ -m make_command ] [ -D var=val [..] ] [ --render ] \\\n"
 	        "%*s[ --camera= [x,y,z,rotx,y,z,dist] | [eyex,y,z,centerx,y,z] ] \\\n"
-	        "%*s[ --imgsize=width,height ] \\\n"
+	        "%*s[ --imgsize=width,height ] [ --projection=o|p] \\\n"
 	        "%*sfilename\n",
 					progname, tab, "", tab, "", tab, "", tab, "");
 	exit(1);
@@ -120,11 +120,18 @@ Camera get_camera( po::variables_map vm )
 		}
 	}
 
-	return camera;
-}
+	if (vm.count("projection")) {
+		string proj = vm["projection"].as<string>();
+		if (proj=="o" || proj=="ortho" || proj=="orthogonal")
+			camera.projection = Camera::ORTHOGONAL;
+		else if (proj=="p" || proj == "perspective")
+			camera.projection = Camera::PERSPECTIVE;
+		else {
+			fprintf(stderr,"projection needs to be 'o' or 'p' for ortho or perspective");
+			exit(1);
+		}
+	}
 
-std::pair<int,int> get_imgsize( po::variables_map vm )
-{
 	int w = RenderSettings::inst()->img_width;
 	int h = RenderSettings::inst()->img_height;
 	if (vm.count("imgsize")) {
@@ -138,7 +145,10 @@ std::pair<int,int> get_imgsize( po::variables_map vm )
 			h = lexical_cast<int>( strs[1] );
 		}
 	}
-	return std::pair<int,int>(w,h);
+	camera.pixel_width = w;
+	camera.pixel_height = h;
+
+	return camera;
 }
 
 int main(int argc, char **argv)
@@ -185,6 +195,7 @@ int main(int argc, char **argv)
 		("render", "if exporting a png image, do a full CGAL render")
 		("camera", po::value<string>(), "parameters for camera when exporting png")
 	  ("imgsize", po::value<string>(), "=width,height for exporting png")
+		("projection", po::value<string>(), "(o)rtho or (p)erspective when exporting png")
 		("o,o", po::value<string>(), "out-file")
 		("s,s", po::value<string>(), "stl-file")
 		("x,x", po::value<string>(), "dxf-file")
@@ -260,9 +271,6 @@ int main(int argc, char **argv)
 	currentdir = boosty::stringy(fs::current_path());
 
 	Camera camera = get_camera( vm );
-	std::pair<int,int> imgsize = get_imgsize( vm );
-	camera.pixel_width = imgsize.first;
-	camera.pixel_height = imgsize.second;
 
 	QDir exdir(QApplication::instance()->applicationDirPath());
 #ifdef Q_WS_MAC