private static void AddBillboard(ref QuadBoard qb, ref CroppedQuad crop)
{
MyTransparentGeometry.AddTriangleBillboard
(
crop.quad.Point0,
crop.quad.Point1,
crop.quad.Point2,
Vector3.Zero, Vector3.Zero, Vector3.Zero,
crop.matBounds.Min,
(crop.matBounds.Min + new Vector2(0f, crop.matBounds.Size.Y)),
crop.matBounds.Max,
qb.textureID, 0,
Vector3D.Zero,
qb.bbColor,
BlendTypeEnum.PostPP
);
MyTransparentGeometry.AddTriangleBillboard
(
crop.quad.Point0,
crop.quad.Point2,
crop.quad.Point3,
Vector3.Zero, Vector3.Zero, Vector3.Zero,
crop.matBounds.Min,
crop.matBounds.Max,
(crop.matBounds.Min + new Vector2(crop.matBounds.Size.X, 0f)),
qb.textureID, 0,
Vector3D.Zero,
qb.bbColor,
BlendTypeEnum.PostPP
);
}
/// <summary>
/// Draws a cropped billboard in world space facing the +Z direction of the matrix specified. Cropping is
/// performed s.t. any parts outside the box defined by maskMin and maskMax are not rendered and WITHOUT
/// warping the texture or displacing the billboard. Units in meters, matrix transform notwithstanding.
/// </summary>
public void DrawCroppedTex(ref CroppedBox box, ref MatrixD matrix)
{
Vector2 size = box.bounds.Size,
pos = box.bounds.Center;
box.bounds = box.bounds.Intersect(box.mask.Value);
Vector2 clipSize = box.bounds.Size;
CroppedQuad crop = default(CroppedQuad);
crop.matBounds = texCoords;
// Normalized cropped size and offset
Vector2 clipScale = clipSize / size,
clipOffset = (box.bounds.Center - pos) / size,
uvScale = crop.matBounds.Size,
uvOffset = crop.matBounds.Center;
pos += clipOffset * size; // Offset billboard to compensate for changes in size
size = clipSize; // Use cropped billboard size
clipOffset *= uvScale * new Vector2(1f, -1f); // Scale offset to fit material and flip Y-axis
// Recalculate texture coordinates to simulate clipping without affecting material alignment
crop.matBounds.Min = ((crop.matBounds.Min - uvOffset) * clipScale) + (uvOffset + clipOffset);
crop.matBounds.Max = ((crop.matBounds.Max - uvOffset) * clipScale) + (uvOffset + clipOffset);
Vector3D worldPos = new Vector3D(pos.X, pos.Y, 0d);
Vector3D.TransformNoProjection(ref worldPos, ref matrix, out worldPos);
MyUtils.GenerateQuad(out crop.quad, ref worldPos, size.X * .5f, size.Y * .5f, ref matrix);
if (skewRatio != 0f)
{
Vector3D start = crop.quad.Point0, end = crop.quad.Point3,
offset = (end - start) * skewRatio * .5;
crop.quad.Point0 = Vector3D.Lerp(start, end, skewRatio) - offset;
crop.quad.Point3 = Vector3D.Lerp(start, end, 1d + skewRatio) - offset;
crop.quad.Point1 -= offset;
crop.quad.Point2 -= offset;
}
AddBillboard(ref this, ref crop);
}
