public static MeshVertex[] CreatePyramid(Vector4 center, float width, float height, float depth,
out ushort[] indices)
{
float halfWidth = width/2;
float halfHeight = height/2;
float halfDepth = depth/2;
Vector4 v0 = new Vector4(0, halfHeight, 0, 0);
Vector4 v1 = new Vector4(halfWidth, -halfHeight, halfDepth,0);
Vector4 v2 = new Vector4(-halfWidth, -halfHeight, halfDepth,0);
Vector4 v3 = new Vector4(halfWidth, -halfHeight, -halfDepth,0);
Vector4 v4 = new Vector4(-halfWidth, -halfHeight, -halfDepth,0);
Vector3 n0 = Normal(v0, v4, v2);
Vector3 n1 = Normal(v0, v3, v4);
Vector3 n2 = Normal(v0, v1, v3);
Vector3 n3 = Normal(v0, v1, v2);
Vector3 n4 = -Vector3.UnitY;
Vector2 tV = new Vector2(0.5f, 0f); // Top Vertex
Vector2 tF0 = new Vector2(0f, 1f); // Face Bottom Left
Vector2 tF1 = new Vector2(1f, 1f); // Face Bottom Right
Vector2 tB0 = new Vector2(0f,0f); // Base top left
Vector2 tB1 = new Vector2(1f, 0f); // Base top Right
MeshVertex[] vertices = new MeshVertex[]
{
// Left face
new MeshVertex(center + v2, n0, tF0),
new MeshVertex(center + v0, n0, tV),
new MeshVertex(center + v4, n0, tF1),
// Front face
new MeshVertex(center + v4, n1, tF0),
new MeshVertex(center + v0, n1, tV),
new MeshVertex(center + v3, n1, tF1),
// Right Face
new MeshVertex(center + v3, n2, tF0),
new MeshVertex(center + v0, n2, tV),
new MeshVertex(center + v1, n2, tF1),
// Back Face
new MeshVertex(center + v1, n3, tF0),
new MeshVertex(center + v0, n3, tV),
new MeshVertex(center + v2, n3, tF1),
// Bottom Face
new MeshVertex(center + v1, n4, tF0),
new MeshVertex(center + v3, n4, tB0),
new MeshVertex(center + v4, n4, tB1),
new MeshVertex(center + v2, n4, tF1),
};
indices = new ushort[] {
2, 1, 0,
5, 4, 3,
8, 7, 6,
11, 10, 9,
12, 13, 14,
14, 15, 12
};
return vertices;
}
public static MeshVertex[] CreateBox(Vector4 center, float width, float height, float depth,
out ushort[] indices)
{
Vector3 frontNormal = new Vector3(0.0f, 0.0f, 1.0f);
Vector3 backNormal = new Vector3(0.0f, 0.0f, -1.0f);
Vector3 topNormal = new Vector3(0.0f, 1.0f, 0.0f);
Vector3 bottomNormal = new Vector3(0.0f, -1.0f, 0.0f);
Vector3 leftNormal = new Vector3(-1.0f, 0.0f, 0.0f);
Vector3 rightNormal = new Vector3(1.0f, 0.0f, 0.0f);
Vector2 textureTopLeft = new Vector2(0.0f, 0.0f);
Vector2 textureTopRight = new Vector2(1.0f, 0.0f);
Vector2 textureBottomLeft = new Vector2(0.0f, 1.0f);
Vector2 textureBottomRight = new Vector2(1.0f, 1.0f);
Vector4 v0 = new Vector4(-width/2, -height/2, depth/2, 0);
Vector4 v1 = new Vector4(-width/2, height/2, depth/2, 0);
Vector4 v2 = new Vector4(width/2, -height/2, depth/2, 0);
Vector4 v3 = new Vector4(width/2, height/2, depth/2, 0);
Vector4 v4 = new Vector4(width/2, -height/2, -depth/2, 0);
Vector4 v5 = new Vector4(width/2, height/2, -depth/2, 0);
Vector4 v6 = new Vector4(-width/2, -height/2, -depth/2, 0);
Vector4 v7 = new Vector4(-width/2, height/2, -depth/2, 0);
MeshVertex[] vertices = new MeshVertex[]
{
// Front Surface
new MeshVertex(center + v0, frontNormal, textureBottomLeft),
new MeshVertex(center + v1,frontNormal,textureTopLeft),
new MeshVertex(center + v2,frontNormal,textureBottomRight),
new MeshVertex(center + v3,frontNormal,textureTopRight),
// Back Surface
new MeshVertex(center + v4,backNormal, textureBottomLeft),
new MeshVertex(center +v5,backNormal, textureTopLeft),
new MeshVertex(center +v6,backNormal, textureBottomRight),
new MeshVertex(center +v7, backNormal, textureTopRight),
// Left Surface
new MeshVertex(center + v6, leftNormal, textureBottomLeft),
new MeshVertex(center + v7,leftNormal, textureTopLeft),
new MeshVertex(center + v0,leftNormal, textureBottomRight),
new MeshVertex(center + v1,leftNormal, textureTopRight),
// Right Surface
new MeshVertex(center + v2,rightNormal, textureBottomLeft),
new MeshVertex(center + v3,rightNormal, textureTopLeft),
new MeshVertex(center + v4,rightNormal, textureBottomRight),
new MeshVertex(center + v5,rightNormal, textureTopRight),
// Top Surface
new MeshVertex(center + v1,topNormal,textureBottomLeft),
new MeshVertex(center + v7,topNormal,textureTopLeft),
new MeshVertex(center + v3,topNormal,textureBottomRight),
new MeshVertex(center + v5,topNormal,textureTopRight),
// Bottom Surface
new MeshVertex(center + v6, bottomNormal,textureBottomLeft),
new MeshVertex(center + v0,bottomNormal,textureTopLeft),
new MeshVertex(center + v4,bottomNormal,textureBottomRight),
new MeshVertex(center + v2,bottomNormal,textureTopRight),
};
indices = new ushort[] {
0, 1, 2, 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
};
return vertices;
}
public bool Equals(MeshVertex other)
{
return other.Position.Equals(Position) && other.Normal.Equals(Normal) && other.TextureUV.Equals(TextureUV);
}