I follow the technique from the book "Introdction to 3D Game Programming with DirectX 9.0" by Frank D. Luna but gets an unusual result:
The issue is with the culling mode I think. The inside of the cube is actually being draw instead of the outside reflected. The process follows(ignoring transformation for now):
cd_pCamera->SetPosition( 10.0f, 5.0f, -10.0f );
cd_pCamera->Update();
Matrix4x4f MatWorld;
MatWorld.MakeIdentity();
cd_pRenderer->SetWorld( MatWorld );
cd_pMesh->Render();
//render mirror
cd_pRenderer->SetTexture( 0, 0 );
cd_pRenderer->RenderPrimitive( cd_VSMirror, PT_TRIANGLE_STRIP, 0, 2 );
//--Apply reflection process--//
cd_pRenderer->EnableStencil( true );
cd_pRenderer->SetStencilFunction( CMPFUNC_ALWAYS );
cd_pRenderer->SetStencilRef( 0x1 );
cd_pRenderer->SetStencilMask( 0xffffffff );
cd_pRenderer->SetStencilWriteMask( 0xffffffff );
cd_pRenderer->SetStencilZFail( STENCILOP_KEEP );
cd_pRenderer->SetStencilFail( STENCILOP_KEEP );
cd_pRenderer->SetStencilPass( STENCILOP_REPLACE );
cd_pRenderer->EnableZWrite( false );
cd_pRenderer->EnableAlphaBlending( true );
cd_pRenderer->SetSourceBlend( BLENDM_ZERO );
cd_pRenderer->SetDestBlend( BLENDM_ONE );
cd_pRenderer->RenderPrimitive( cd_VSMirror, PT_TRIANGLE_STRIP, 0, 2 );
cd_pRenderer->EnableZWrite( true );
cd_pRenderer->SetStencilFunction( CMPFUNC_EQUAL );
cd_pRenderer->SetStencilPass( STENCILOP_KEEP );
//clear depth buffer
cd_pViewport->Clear( false, true, false );
cd_pRenderer->SetSourceBlend( BLENDM_DESTCOLOR );
cd_pRenderer->SetDestBlend( BLENDM_ZERO );
cd_pRenderer->SetCullMode( CM_CW );
MatWorld.MakeTranslation( Vector3f(0.0f, 0.0f, 8.0f) );
cd_pRenderer->SetWorld( MatWorld );
cd_pMesh->Render();
cd_pRenderer->EnableStencil( false );
cd_pRenderer->EnableAlphaBlending( false );
cd_pRenderer->SetCullMode( CM_CCW );
//--//
I specify the cube geometry like so:
DirectForce Model //ID
txt //Txt for text, bin for binary
Version{1} //Version
MaterialCount{1} //Number of materials
MeshCount{1} //Number of meshes
Material{
1.000000, 1.000000, 1.000000, 1.000000; //Diffuse r, g, b, a
1.000000, 1.000000, 1.000000, 1.000000; //Ambient r, g, b, a
0.000000, 0.000000, 0.000000, 0.000000; //Specular r, g, b, a
0.000000, 0.000000, 0.000000, 0.000000; //Emissive r, g, b, a
0.000000; //Specular power
"cloud.tga"; //Texture filename
}
Mesh{ //Mesh
0; //Material index
3; //Vertex format: 3 - PN1TC
24; //Vertex count
12; //Triangle count
Vertices{
-1.0, -1.0, -1.0, 0.0, 0.0, -1.0, 0.0, 1.0;
-1.0, 1.0, -1.0, 0.0, 0.0, -1.0, 0.0, 0.0;
1.0, -1.0, -1.0, 0.0, 0.0, -1.0, 1.0, 1.0;
1.0, 1.0, -1.0, 0.0, 0.0, -1.0, 1.0, 0.0;
1.0, -1.0, 1.0, 0.0, 0.0, 1.0, 0.0, 1.0;
1.0, 1.0, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0;
-1.0, -1.0, 1.0, 0.0, 0.0, 1.0, 1.0, 1.0;
-1.0, 1.0, 1.0, 0.0, 0.0, 1.0, 1.0, 0.0;
-1.0, 1.0, -1.0, 0.0, 1.0, 0.0, 0.0, 1.0;
-1.0, 1.0, 1.0, 0.0, 1.0, 0.0, 0.0, 0.0;
1.0, 1.0, -1.0, 0.0, 1.0, 0.0, 1.0, 1.0;
1.0, 1.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0;
-1.0, -1.0, 1.0, 0.0, 1.0, 0.0, 0.0, 1.0;
-1.0, -1.0, -1.0, 0.0, 1.0, 0.0, 0.0, 0.0;
1.0, -1.0, 1.0, 0.0, 1.0, 0.0, 1.0, 1.0;
1.0, -1.0, -1.0, 0.0, 1.0, 0.0, 1.0, 0.0;
-1.0, -1.0, 1.0, -1.0, 0.0, 0.0, 0.0, 1.0;
-1.0, 1.0, 1.0, -1.0, 0.0, 0.0, 0.0, 0.0;
-1.0, -1.0, -1.0, -1.0, 0.0, 0.0, 1.0, 1.0;
-1.0, 1.0, -1.0, -1.0, 0.0, 0.0, 1.0, 0.0;
1.0, -1.0, -1.0, 1.0, 0.0, 0.0, 0.0, 1.0;
1.0, 1.0, -1.0, 1.0, 0.0, 0.0, 0.0, 0.0;
1.0, -1.0, 1.0, 1.0, 0.0, 0.0, 1.0, 1.0;
1.0, 1.0, 1.0, 1.0, 0.0, 0.0, 1.0, 0.0;
}
Triangles{
0, 1, 2; //Vertex indices
2, 1, 3;
4, 5, 6;
6, 5, 7;
8, 9, 10;
10, 9, 11;
12, 13, 14;
14, 13, 15;
16, 17, 18;
18, 17, 19;
20, 21, 22;
22, 21, 23;
}
}
This is the custom file format I defined for my engine, but you get the idea.
Any idea on what I'm doing wrong?
