/// <summary>
/// Create a mesh object that represents the wall.
///
/// </summary>
/// <param name="roomSize">The size of the room</param>
/// <param name="whichWall">Which wall of the room are we creating</param>
/// <param name="res">The Resolution of the mesh, meaning, the number of rows and columns of quads to create.</param>
/// <returns>The mesh3D object representing the wall</returns>
public static AABBFaceMesh CreateFace(GraphicsInterface gi, Vector3D roomSize, AABBFace whichWall, Resolution res, GLTexture texture)
{
AABBFaceMesh wall = new AABBFaceMesh(gi, roomSize, whichWall);
Vector3f[] vertices = new Vector3f[(res.Columns)*(res.Rows)*4];
TextureCoordinates[] texCoords = new TextureCoordinates[(res.Columns) * (res.Rows)*4];
int[] indices = new int[res.Columns * res.Rows * 4];
// The general routine is to create a mesh in the x-y plane, using
// the appropriate width and height.
// Then take this mesh and rotate and translate it into the right position
// after it is created.
// First calculate the min/max values in the x-y plane
float minX=0.0f;
float maxX=0.0f;
float minY=0.0f;
float maxY=0.0f;
switch (whichWall)
{
case AABBFace.Front:
case AABBFace.Back:
minX = roomSize.X / -2;
maxX = roomSize.X / 2;
minY = roomSize.Y / -2;
maxY = roomSize.Y / 2;
break;
case AABBFace.Left:
case AABBFace.Right:
minX = roomSize.Z / -2;
maxX = roomSize.Z / 2;
minY = roomSize.Y / -2;
maxY = roomSize.Y / 2;
break;
case AABBFace.Ceiling:
case AABBFace.Floor:
minX = roomSize.X / -2;
maxX = roomSize.X / 2;
minY = roomSize.Z / -2;
maxY = roomSize.Z / 2;
break;
}
// Now that we have the min/max sizes in the x-y plane
// Construct the quad vertices based on the resolution.
// Start from the bottom (negative y) and go up
// Move from left (negative x) to right
float xDiff = maxX - minX;
float yDiff = maxY - minY;
float xIncr = xDiff / res.Columns;
float yIncr = yDiff / res.Rows;
int vIndex = 0;
for (int row = 0; row < res.Rows; row++)
{
for (int column = 0; column < res.Columns; column++)
{
Vector3f vertex1 = new Vector3f(minX + column * xIncr, minY + row * yIncr, 0);
Vector3f vertex2 = new Vector3f(minX + (column + 1) * xIncr, minY + row * yIncr, 0);
Vector3f vertex3 = new Vector3f(minX + (column + 1) * xIncr, minY + (row + 1) * yIncr, 0);
Vector3f vertex4 = new Vector3f(minX + column * xIncr, minY + (row + 1) * yIncr, 0);
// Set the vertices for the quad
vertices[vIndex + 0] = vertex1;
vertices[vIndex + 1] = vertex2;
vertices[vIndex + 2] = vertex3;
vertices[vIndex + 3] = vertex4;
// Set the indices for the quad
indices[vIndex + 0] = vIndex;
indices[vIndex + 1] = vIndex + 1;
indices[vIndex + 2] = vIndex + 2;
indices[vIndex + 3] = vIndex + 3;
// Set the texture coords for the quad
texCoords[vIndex + 0].Set(0.0f, 0.0f);
texCoords[vIndex + 1].Set(1.0f, 0.0f);
texCoords[vIndex + 2].Set(1.0f, 1.0f);
texCoords[vIndex + 3].Set(0.0f, 1.0f);
vIndex += 4;
}
}
// assign all the attributes to the mesh object
// and return it.
wall.SetIndices(indices);
wall.SetVertices(vertices);
wall.SetTextureCoordinates(texCoords);
wall.Texture = texture;
// Now transform the vertices based on which wall it is we are constructing
minX = roomSize.X / -2;
maxX = roomSize.X / 2;
minY = roomSize.Y / -2;
maxY = roomSize.Y / 2;
float minZ = roomSize.Z / -2;
float maxZ = roomSize.Z / 2;
Transformation transform = new Transformation();
switch (whichWall)
{
case AABBFace.Front:
transform.Translate(new float3(0, 0, minZ));
break;
case AABBFace.Back:
transform.SetRotate(float3x3.Rotate((float)Math.PI, new float3(0, 1, 0)));
transform.Translate(new float3(0, 0, maxZ));
break;
case AABBFace.Left:
transform.SetRotate(float3x3.Rotate((float)Math.PI/2, new float3(0, 1, 0)));
transform.Translate(new float3(minX, 0, 0));
break;
case AABBFace.Right:
transform.SetRotate(float3x3.Rotate((float)-Math.PI/2, new float3(0, 1, 0)));
transform.Translate(new float3(maxX, 0, 0));
break;
case AABBFace.Ceiling:
transform.SetRotate(float3x3.Rotate((float)-Math.PI/2, new float3(1, 0, 0)));
transform.Translate(new float3(0, maxY, 0));
break;
case AABBFace.Floor:
transform.SetRotate(float3x3.Rotate((float)Math.PI/2, new float3(1, 0, 0)));
transform.Translate(new float3(0, minY, 0));
break;
}
wall.ApplyTransform(transform);
return wall;
}