void CreateTriBillboard(Vector3 position, float radius, Color4 color, float angle, Vector2 texA, Vector2 texB, Vector2 texC)
{
/* Create triangle points */
var rOn2 = radius * 0.5f; //this should be much faster than division
var rOn4 = radius * 0.25f;
var ptC = new Vector3(0, -(rOn2), angle);
var ptB = new Vector3(-rOn2 * sin120, -rOn2 * cos120, angle);
var ptA = new Vector3(-rOn4 * sin240, -rOn4 * cos240, angle); //triangle is half as tall as it is wide
verticesBasic [vertexCountBasic++] = new BillboardVert()
{
Position = position,
Color = color,
TextureCoordinate = texA,
Dimensions = ptA
};
verticesBasic [vertexCountBasic++] = new BillboardVert()
{
Position = position,
Color = color,
TextureCoordinate = texB,
Dimensions = ptB
};
verticesBasic [vertexCountBasic++] = new BillboardVert()
{
Position = position,
Color = color,
TextureCoordinate = texC,
Dimensions = ptC
};
}
void CreateBillboard(Vector3 position, Vector2 size, Color4 color, float angle, Vector2 topleft, Vector2 topright, Vector2 bottomleft, Vector2 bottomright, Vector3 src_right, Vector3 src_up)
{
var sz1 = new Vector3(size.X * -0.5f, size.Y * -0.5f, angle);
var sz2 = new Vector3(size.X * 0.5f, size.Y * -0.5f, angle);
var sz3 = new Vector3(size.X * -0.5f, size.Y * 0.5f, angle);
var sz4 = new Vector3(size.X * 0.5f, size.Y * 0.5f, angle);
vertices[vertexCount++] = new BillboardVert()
{
Position = position,
Color = color,
TextureCoordinate = bottomleft,
Dimensions = sz1,
Right = src_right,
Up = src_up
};
vertices[vertexCount++] = new BillboardVert()
{
Position = position,
Color = color,
TextureCoordinate = topleft,
Dimensions = sz2,
Right = src_right,
Up = src_up
};
vertices[vertexCount++] = new BillboardVert()
{
Position = position,
Color = color,
TextureCoordinate = bottomright,
Dimensions = sz3,
Right = src_right,
Up = src_up
};
vertices[vertexCount++] = new BillboardVert()
{
Position = position,
Color = color,
TextureCoordinate = topright,
Dimensions = sz4,
Right = src_right,
Up = src_up
};
}
void CreateBillboard(Vector3 position, Vector2 size, Color4 color, float angle, Vector2 topleft, Vector2 topright, Vector2 bottomleft, Vector2 bottomright)
{
var sz1 = new Vector3(size.X * -0.5f, size.Y * -0.5f, angle);
var sz2 = new Vector3(size.X * 0.5f, size.Y * -0.5f, angle);
var sz3 = new Vector3(size.X * -0.5f, size.Y * 0.5f, angle);
var sz4 = new Vector3(size.X * 0.5f, size.Y * 0.5f, angle);
verticesBasic[vertexCountBasic++] = new BillboardVert()
{
Position = position,
Color = color,
TextureCoordinate = bottomleft,
Dimensions = sz1
};
verticesBasic[vertexCountBasic++] = new BillboardVert()
{
Position = position,
Color = color,
TextureCoordinate = topleft,
Dimensions = sz2
};
verticesBasic[vertexCountBasic++] = new BillboardVert()
{
Position = position,
Color = color,
TextureCoordinate = bottomright,
Dimensions = sz3
};
verticesBasic[vertexCountBasic++] = new BillboardVert()
{
Position = position,
Color = color,
TextureCoordinate = topright,
Dimensions = sz4
};
}
