Improved view distance

1 files changed, 29 insertions, 15 deletions

diff --git a/tests/OffscreenView.cc b/tests/OffscreenView.cc
index 95063b6..f137041 100644
--- a/tests/OffscreenView.cc
+++ b/tests/OffscreenView.cc
@@ -7,8 +7,10 @@
 #define FAR_FAR_AWAY 100000.0
 
 OffscreenView::OffscreenView(size_t width, size_t height)
-	: orthomode(false), showaxes(true), showfaces(true), showedges(false), viewer_distance(500), 
-		object_rot_x(35), object_rot_y(0), object_rot_z(25)
+	: orthomode(false), showaxes(true), showfaces(true), showedges(false),
+		object_rot_x(35), object_rot_y(0), object_rot_z(25), 
+		camera_eye_x(0), camera_eye_y(0), camera_eye_z(0),
+		camera_center_x(0), camera_center_y(0), camera_center_z(0)
 {
 	for (int i = 0; i < 10; i++) this->shaderinfo[i] = 0;
   this->ctx = create_offscreen_context(width, height);
@@ -158,27 +160,27 @@ void OffscreenView::setupPerspective()
 {
 	glMatrixMode(GL_PROJECTION);
 	glLoadIdentity();
-	glFrustum(-w_h_ratio, +w_h_ratio, -(1/w_h_ratio), +(1/w_h_ratio), +10.0, +FAR_FAR_AWAY);
+	gluPerspective(90, w_h_ratio, 0.1*(this->camera_center_y - this->camera_eye_y), 
+								 3*(this->camera_center_y - this->camera_eye_y));
 }
 
-void OffscreenView::setupOrtho(double distance, bool offset)
+void OffscreenView::setupOrtho(bool offset)
 {
 	glMatrixMode(GL_PROJECTION);
 	glLoadIdentity();
-	if(offset)
-		glTranslated(-0.8, -0.8, 0);
-	double l = distance/10;
+	if (offset) glTranslated(-0.8, -0.8, 0);
+	double l = (this->camera_eye_y - this->camera_center_y)/10;
 	glOrtho(-w_h_ratio*l, +w_h_ratio*l,
-			-(1/w_h_ratio)*l, +(1/w_h_ratio)*l,
-			-FAR_FAR_AWAY, +FAR_FAR_AWAY);
+					-(1/w_h_ratio)*l, +(1/w_h_ratio)*l,
+					-FAR_FAR_AWAY, +FAR_FAR_AWAY);
 }
 
 void OffscreenView::paintGL()
 {
 	glEnable(GL_LIGHTING);
 
-	if (orthomode)
-		setupOrtho(viewer_distance);
+	if (orthomode) setupOrtho();
+	else setupPerspective();
 
 	glMatrixMode(GL_MODELVIEW);
 	glLoadIdentity();
@@ -187,9 +189,9 @@ void OffscreenView::paintGL()
 
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
 
-	gluLookAt(0.0, -viewer_distance, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0);
-
-//	glTranslated(object_trans_x, object_trans_y, object_trans_z);
+	gluLookAt(this->camera_eye_x, this->camera_eye_y, this->camera_eye_z,
+						this->camera_center_x, this->camera_center_y, this->camera_center_z, 
+						0.0, 0.0, 1.0);
 
 	glRotated(object_rot_x, 1.0, 0.0, 0.0);
 	glRotated(object_rot_y, 0.0, 1.0, 0.0);
@@ -202,7 +204,7 @@ void OffscreenView::paintGL()
 		glLineWidth(1);
 		glColor3d(0.5, 0.5, 0.5);
 		glBegin(GL_LINES);
-		double l = viewer_distance/10;
+		double l = 3*(this->camera_eye_y - this->camera_center_y);
 		glVertex3d(-l, 0, 0);
 		glVertex3d(+l, 0, 0);
 		glVertex3d(0, -l, 0);
@@ -231,3 +233,15 @@ bool OffscreenView::save(const char *filename)
 {
 	return save_framebuffer(this->ctx, filename);
 }
+
+void OffscreenView::setCamera(double xpos, double ypos, double zpos, 
+															double xcenter, double ycenter, double zcenter)
+{
+	this->camera_eye_x = xpos;
+	this->camera_eye_y = ypos;
+	this->camera_eye_z = zpos;
+	this->camera_center_x = xcenter;
+	this->camera_center_y = ycenter;
+	this->camera_center_z = zcenter;
+}
+