Compute near/far clipping planes

diff --git a/src/grits-opengl.c b/src/grits-opengl.c
index 7b5697e4b19b529a36f28921c4f6f642114e1670..dc13ea2411bbdcb6eb482b1efb95032b4a1064cd 100644 (file)
--- a/src/grits-opengl.c
+++ b/src/grits-opengl.c
@@ -57,13 +57,30 @@ struct RenderLevel {
  ***********/
 static void _set_visuals(GritsOpenGL *opengl)
 {
+       double lat, lon, elev, rx, ry, rz;
+       grits_viewer_get_location(GRITS_VIEWER(opengl), &lat, &lon, &elev);
+       grits_viewer_get_rotation(GRITS_VIEWER(opengl), &rx, &ry, &rz);
+
+       /* Set projection and clipping planes */
+       glMatrixMode(GL_PROJECTION);
+       glLoadIdentity();
+
+       double width  = GTK_WIDGET(opengl)->allocation.width;
+       double height = GTK_WIDGET(opengl)->allocation.height;
+       double ang    = atan(height/FOV_DIST);
+       double atmos  = 100000;
+       double near   = MAX(elev - atmos, 10);    // View 100km of atmosphere
+       double far    = elev + 2*EARTH_R + atmos; // on both sides of the earth
+
+       grits_viewer_get_location(GRITS_VIEWER(opengl), &lat, &lon, &elev);
+       glViewport(0, 0, width, height);
+       gluPerspective(rad2deg(ang)*2, width/height, near, far);
+
+       /* Setup camera and lighting */
        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
 
        /* Camera 1 */
-       double lat, lon, elev, rx, ry, rz;
-       grits_viewer_get_location(GRITS_VIEWER(opengl), &lat, &lon, &elev);
-       grits_viewer_get_rotation(GRITS_VIEWER(opengl), &rx, &ry, &rz);
        glRotatef(rx, 1, 0, 0);
        glRotatef(rz, 0, 0, 1);
 
@@ -159,16 +176,7 @@ static gboolean on_configure(GritsOpenGL *opengl, GdkEventConfigure *event, gpoi
 {
        g_debug("GritsOpenGL: on_configure");
 
-       double width  = GTK_WIDGET(opengl)->allocation.width;
-       double height = GTK_WIDGET(opengl)->allocation.height;
-
-       /* Setup OpenGL Window */
-       glViewport(0, 0, width, height);
-       glMatrixMode(GL_PROJECTION);
-       glLoadIdentity();
-       double ang = atan(height/FOV_DIST);
-       gluPerspective(rad2deg(ang)*2, width/height, 10, 100*EARTH_R);
-
+       _set_visuals(opengl);
 #ifndef ROAM_DEBUG
        g_mutex_lock(opengl->sphere_lock);
        roam_sphere_update_errors(opengl->sphere);