4 replies to this topic

[TheLionKing]

Hi,

I have simple drawn a 3d Triangle or a pyramid with four faces. There order is

1 - Front Face
2 - Left Face
3- Back Face
4- Right Face

Pyramid is drawn right ... my problem is I can see through it. After ananlyzing it I came to the following observations :

• Through 1 I can see 2, 3 & 4.
  
• Through 2, I can see 3 & 4.
  
• Through 3 I can see only 4.
  
• And nothing can be seen through 4.

How come I am seeing through surfaces.
There is something I am missing, right?

Please help!

[anubis]

hmm, depth-buffer enabled ?
setup the projection matrix in the right way ?
backface culling enabled ?

[TheLionKing]

Depth Buffer is enabled, lighting is off and Back Face Culling is off. Here is the code :

Graphics->SetRenderState (D3DRS_LIGHTING, false);    // Set Lights Off
 Graphics->SetRenderState (D3DRS_CULLMODE, D3DCULL_NONE); // Do not cull Back Faces
 Graphics->SetRenderState (D3DRS_ZENABLE, D3DZB_TRUE);  // Enable Depth Buffering

And for the Projection Matrix :

 float AspectRatio = (float)Width / (float)Height; // Ratio between Width & Height

// Initialize Perspective View for the Screen
 D3DXMatrixPerspectiveFovLH (&Projection, // Projection Matrix
               1.0f,    // Field of View
               AspectRatio, // Aspect Ratio of the Screen
               0.0f,    // Nearest Clipping Plane
               100.0f);   // Farthest Clipping Plane
 
 // Setup Projection Matrix for the Screen
 Graphics->SetTransform (D3DTS_PROJECTION, &Projection);

Is there anything to do with nearest clipping plane or the Field Of View? :sigh:

[TheLionKing]

It was nearest clipping plane ... thanks :lol: !

[anubis]

i was going to tell you just that...