private void DrawSide( eSides side, ref List<Chunk> chunks )
{
#region Setup constants for current direction
double _Zero = 0.0; // 0/3
double _Three = 0.3333333333333; // 1/3
double _Six = 0.66666666666666; // 2/3
double _One = 1.0; // 3/3
double ThirdLength = SideLength / 3f;
Vector3d C0 = Center + new Vector3d( -SideLength, -SideLength, +SideLength );
Vector3d C1 = Center + new Vector3d( +SideLength, -SideLength, +SideLength );
Vector3d C2 = Center + new Vector3d( +SideLength, +SideLength, +SideLength );
Vector3d C3 = Center + new Vector3d( -SideLength, +SideLength, +SideLength );
Vector3d C4 = Center + new Vector3d( -SideLength, -SideLength, -SideLength );
Vector3d C5 = Center + new Vector3d( +SideLength, -SideLength, -SideLength );
Vector3d C6 = Center + new Vector3d( +SideLength, +SideLength, -SideLength );
Vector3d C7 = Center + new Vector3d( -SideLength, +SideLength, -SideLength );
Vector3d P0, P1, P2, P3, P4, P5, P6, P7;
switch ( side )
{
case eSides.Front:
P0 = C0;
P1 = C1;
P2 = C2;
P3 = C3;
P4 = C4;
P5 = C5;
P6 = C6;
P7 = C7;
break;
case eSides.Back:
P0 = C5;
P1 = C4;
P2 = C7;
P3 = C6;
P4 = C1;
P5 = C0;
P6 = C3;
P7 = C2;
break;
case eSides.Right:
P0 = C1;
P1 = C5;
P2 = C6;
P3 = C2;
P4 = C0;
P5 = C4;
P6 = C7;
P7 = C3;
break;
case eSides.Left:
P0 = C4;
P1 = C0;
P2 = C3;
P3 = C7;
P4 = C5;
P5 = C1;
P6 = C2;
P7 = C6;
break;
case eSides.Top:
P0 = C3;
P1 = C2;
P2 = C6;
P3 = C7;
P4 = C0;
P5 = C1;
P6 = C5;
P7 = C4;
break;
case eSides.Bottom:
P0 = C1;
P1 = C0;
P2 = C4;
P3 = C5;
P4 = C2;
P5 = C3;
P6 = C7;
P7 = C6;
break;
default:
throw new NotImplementedException( "Unknown enum value: " + side );
}
#endregion Setup constants for current direction
#region Set Normal
Vector3d FaceNormal;
switch ( side )
{
case eSides.Front:
FaceNormal = Vector3d.UnitZ;
break;
case eSides.Back:
FaceNormal = -Vector3d.UnitZ;
break;
case eSides.Right:
FaceNormal = Vector3d.UnitX;
break;
case eSides.Left:
FaceNormal = -Vector3d.UnitX;
break;
case eSides.Top:
FaceNormal = Vector3d.UnitY;
break;
case eSides.Bottom:
FaceNormal = -Vector3d.UnitY;
break;
default:
throw new NotImplementedException( "Unknown enum value: " + side );
}
#endregion Set Normal
bool FaceIsVisible = false;
foreach ( eSides s in VisibleSides )
{
if ( s == side )
{
FaceIsVisible = true;
break;
}
}
if ( FaceIsVisible )
{
#region Define Layer1 Vertices
Chunk Layer1 = new Chunk( 8, 8 * 3 );
Layer1.Vertices[0].TexCoord = new Vector2d( _Zero, _Zero );
Layer1.Vertices[0].Normal = FaceNormal;
Layer1.Vertices[0].Position = P0;
Layer1.Vertices[1].TexCoord = new Vector2d( _One, _Zero );
Layer1.Vertices[1].Normal = FaceNormal;
Layer1.Vertices[1].Position = P1;
Layer1.Vertices[2].TexCoord = new Vector2d( _One, _One );
Layer1.Vertices[2].Normal = FaceNormal;
Layer1.Vertices[2].Position = P2;
Layer1.Vertices[3].TexCoord = new Vector2d( _Zero, _One );
Layer1.Vertices[3].Normal = FaceNormal;
Layer1.Vertices[3].Position = P3;
Layer1.Vertices[4].TexCoord = new Vector2d( _Three, _Three );
Layer1.Vertices[4].Normal = FaceNormal;
Vector3d.Lerp( ref P0, ref P2, _Three, out Layer1.Vertices[4].Position );
Layer1.Vertices[5].TexCoord = new Vector2d( _Six, _Three );
Layer1.Vertices[5].Normal = FaceNormal;
Vector3d.Lerp( ref P1, ref P3, _Three, out Layer1.Vertices[5].Position );
Layer1.Vertices[6].TexCoord = new Vector2d( _Six, _Six );
Layer1.Vertices[6].Normal = FaceNormal;
Vector3d.Lerp( ref P0, ref P2, _Six, out Layer1.Vertices[6].Position );
Layer1.Vertices[7].TexCoord = new Vector2d( _Three, _Six );
Layer1.Vertices[7].Normal = FaceNormal;
Vector3d.Lerp( ref P1, ref P3, _Six, out Layer1.Vertices[7].Position );
#endregion Define Layer1 Vertices
#region Define Layer1 Indices
Layer1.Indices[0] = 0;
Layer1.Indices[1] = 5;
Layer1.Indices[2] = 4;
Layer1.Indices[3] = 0;
Layer1.Indices[4] = 1;
Layer1.Indices[5] = 5;
Layer1.Indices[6] = 5;
Layer1.Indices[7] = 1;
Layer1.Indices[8] = 2;
Layer1.Indices[9] = 6;
Layer1.Indices[10] = 5;
Layer1.Indices[11] = 2;
Layer1.Indices[12] = 7;
Layer1.Indices[13] = 6;
Layer1.Indices[14] = 2;
Layer1.Indices[15] = 3;
Layer1.Indices[16] = 7;
Layer1.Indices[17] = 2;
Layer1.Indices[18] = 0;
Layer1.Indices[19] = 7;
Layer1.Indices[20] = 3;
Layer1.Indices[21] = 0;
Layer1.Indices[22] = 4;
Layer1.Indices[23] = 7;
chunks.Add( Layer1 );
#endregion Define Layer1 Indices
}
#region Define Layer2 Vertices
Chunk Layer2 = new Chunk( 12, 8 * 3 );
Vector3d T0, T1, T2, T3;
Vector3d.Lerp( ref P0, ref P4, _Six, out T0 );
Vector3d.Lerp( ref P1, ref P5, _Six, out T1 );
Vector3d.Lerp( ref P2, ref P6, _Six, out T2 );
Vector3d.Lerp( ref P3, ref P7, _Six, out T3 );
Layer2.Vertices[0].TexCoord = new Vector2d( _Three, _Zero );
Layer2.Vertices[0].Normal = FaceNormal;
Vector3d.Lerp( ref T0, ref T1, _Three, out Layer2.Vertices[0].Position );
Layer2.Vertices[1].TexCoord = new Vector2d( _Six, _Zero );
Layer2.Vertices[1].Normal = FaceNormal;
Vector3d.Lerp( ref T0, ref T1, _Six, out Layer2.Vertices[1].Position );
Layer2.Vertices[3].TexCoord = new Vector2d( _One, _Three );
Layer2.Vertices[3].Normal = FaceNormal;
Vector3d.Lerp( ref T1, ref T2, _Three, out Layer2.Vertices[3].Position );
Layer2.Vertices[4].TexCoord = new Vector2d( _One, _Six );
Layer2.Vertices[4].Normal = FaceNormal;
Vector3d.Lerp( ref T1, ref T2, _Six, out Layer2.Vertices[4].Position );
Layer2.Vertices[6].TexCoord = new Vector2d( _Six, _One );
Layer2.Vertices[6].Normal = FaceNormal;
Vector3d.Lerp( ref T2, ref T3, _Three, out Layer2.Vertices[6].Position );
Layer2.Vertices[7].TexCoord = new Vector2d( _Three, _One );
Layer2.Vertices[7].Normal = FaceNormal;
Vector3d.Lerp( ref T2, ref T3, _Six, out Layer2.Vertices[7].Position );
Layer2.Vertices[9].TexCoord = new Vector2d( _Zero, _Six );
Layer2.Vertices[9].Normal = FaceNormal;
Vector3d.Lerp( ref T3, ref T0, _Three, out Layer2.Vertices[9].Position );
Layer2.Vertices[10].TexCoord = new Vector2d( _Zero, _Three );
Layer2.Vertices[10].Normal = FaceNormal;
Vector3d.Lerp( ref T3, ref T0, _Six, out Layer2.Vertices[10].Position );
Layer2.Vertices[2].TexCoord = new Vector2d( _Six, _Three );
Layer2.Vertices[2].Normal = FaceNormal;
Vector3d.Lerp( ref Layer2.Vertices[1].Position, ref Layer2.Vertices[6].Position, _Three, out Layer2.Vertices[2].Position );
Layer2.Vertices[5].TexCoord = new Vector2d( _Six, _Six );
Layer2.Vertices[5].Normal = FaceNormal;
Vector3d.Lerp( ref Layer2.Vertices[1].Position, ref Layer2.Vertices[6].Position, _Six, out Layer2.Vertices[5].Position );
Layer2.Vertices[8].TexCoord = new Vector2d( _Three, _Six );
Layer2.Vertices[8].Normal = FaceNormal;
Vector3d.Lerp( ref Layer2.Vertices[7].Position, ref Layer2.Vertices[0].Position, _Three, out Layer2.Vertices[8].Position );
Layer2.Vertices[11].TexCoord = new Vector2d( _Three, _Three );
Layer2.Vertices[11].Normal = FaceNormal;
Vector3d.Lerp( ref Layer2.Vertices[7].Position, ref Layer2.Vertices[0].Position, _Six, out Layer2.Vertices[11].Position );
#endregion Define Layer2 Vertices
#region Define Layer2 Indices
Layer2.Indices[0] = 0;
Layer2.Indices[1] = 2;
Layer2.Indices[2] = 11;
Layer2.Indices[3] = 0;
Layer2.Indices[4] = 1;
Layer2.Indices[5] = 2;
Layer2.Indices[6] = 2;
Layer2.Indices[7] = 3;
Layer2.Indices[8] = 4;
Layer2.Indices[9] = 2;
Layer2.Indices[10] = 4;
Layer2.Indices[11] = 5;
Layer2.Indices[12] = 5;
Layer2.Indices[13] = 6;
Layer2.Indices[14] = 8;
Layer2.Indices[15] = 8;
Layer2.Indices[16] = 6;
Layer2.Indices[17] = 7;
Layer2.Indices[18] = 11;
Layer2.Indices[19] = 8;
Layer2.Indices[20] = 10;
Layer2.Indices[21] = 10;
Layer2.Indices[22] = 8;
Layer2.Indices[23] = 9;
chunks.Add( Layer2 );
#endregion Define Layer2 Indices
}
private void Subdivide( double Scale, ref VertexT2dN3dV3d first, ref VertexT2dN3dV3d second, ref VertexT2dN3dV3d third, out Chunk c )
{
c = new Chunk(6, 12);
c.Vertices[0] = first;
Vector3d.Lerp(ref first.Position, ref second.Position, 0.5,out c.Vertices[1].Normal );
c.Vertices[1].Normal.Normalize();
c.Vertices[1].Position = c.Vertices[1].Normal * Scale;
Vector2d.Lerp( ref first.TexCoord, ref second.TexCoord, 0.5, out c.Vertices[1].TexCoord );
Vector3d.Lerp( ref third.Position, ref first.Position, 0.5, out c.Vertices[2].Normal );
c.Vertices[2].Normal.Normalize();
c.Vertices[2].Position = c.Vertices[2].Normal * Scale;
Vector2d.Lerp( ref third.TexCoord, ref first.TexCoord, 0.5, out c.Vertices[2].TexCoord );
c.Vertices[3] = second;
Vector3d.Lerp( ref second.Position, ref third.Position, 0.5, out c.Vertices[4].Normal );
c.Vertices[4].Normal.Normalize();
c.Vertices[4].Position = c.Vertices[4].Normal * Scale;
Vector2d.Lerp( ref second.TexCoord, ref third.TexCoord, 0.5, out c.Vertices[4].TexCoord );
c.Vertices[5] = third;
#region Indices
c.Indices[0]=0;
c.Indices[1]=1;
c.Indices[2]=2;
c.Indices[3]=2;
c.Indices[4]=1;
c.Indices[5]=4;
c.Indices[6]=1;
c.Indices[7]=3;
c.Indices[8]=4;
c.Indices[9]=2;
c.Indices[10]=4;
c.Indices[11]=5;
#endregion Indices
}
