|
|
Hello, I have probably very basic question and I am not fully sure where does it belong, but since I am learning using JOGL I will ask it here. Basically I have triangle rendered on the screen using very basic example:
gl2.glBegin(GL2.GL_TRIANGLES);
gl2.glColor3f(1.0f, 0.0f, 0.0f);
gl2.glVertex3f(-0.5f, -0.5f, 0.0f);
gl2.glVertex3f( 0.5f, -0.5f, 0.0f);
gl2.glVertex3f(-0.5f, 0.5f, 0.0f);
gl2.glEnd();
It is displaying correctly as I expect the red triangle. Now if I add another one at exactly the same position, but with z = -0.5f for each vertex (with green color for example). I see green colored triangle displayed over the red one. I would like to understand why? The coordinate system suggest that the negative Z should be placing objects further in the space, but it looks like it is not true.
I am not applying any projection, the diplay() method is composed soloely by the two triangles and the:
gl2.glClear(GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT);
In init() method I do enable the depth test.
gl2.glEnable(GL2.GL_DEPTH_TEST);
gl2.glDepthMask(true);
So why in this case I see the green triangle over the red one and not the other way around (which seems more logical according to the coordinate system explanations I have read in multiple sites)?
|
Locked
