* Fix OpenGL orientation (it's supposed to be right-handed).

* Add a grayscale plane to illustrate non-orthogonality.

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/research@2723 92316355-f0b4-4df1-b90c-862c8a59935f

2008-rubik/colorcube/visu.c

@@ -70,8 +70,8 @@ static void reshape(int w, int h)
 }
 
 #define F(x) ((x)*1.01 - 0.005)
-#define CP       glColor4f(x0,y0,z0,0.5); glVertex3f(y0,x0,z0)
-#define BP       glColor3f(0.0,0.0,0.0); glVertex3f(F(y0),F(x0),F(z0))
+#define CP       glColor4f(x0,y0,z0,0.5); glVertex3f(x0,y0,z0)
+#define BP       glColor3f(0.0,0.0,0.0); glVertex3f(F(x0),F(y0),F(z0))
 #define BLACK    x0 = y0 = z0 = 0.0
 #define RED      x0 = 1.0; y0 = z0 = 0.0
 //#define XRED     x0 = 0.8; y0 = z0 = 0.0
@@ -126,6 +126,14 @@ static void display(void)
             XGREEN; BP; WHITE; BP;
             WHITE; BP; XRED; BP;
         glEnd();
+        glTranslatef(.5, .5, .4);
+        glColor4f(.5, .5, .5, .5);
+        glBegin(GL_QUADS);
+            glVertex3f(0.891063,-0.45388,0);
+            glVertex3f(0.0773943,0.151941,-0.985355);
+            glVertex3f(-0.891063,0.45388,0);
+            glVertex3f(-0.0773943,-0.151941,0.985355);
+        glEnd();
     glPopMatrix();
 
     glutSwapBuffers();