// Works only when the Read/Write enabled flag is set inside the sprite texture properties.
// Otherwise, it will always return false.
public static bool IsPixelFullyTransparent(this SpriteRenderer spriteRenderer, Vector3 worldPos)
{
Sprite sprite = spriteRenderer.sprite;
if (sprite == null)
{
return(true);
}
Texture2D spriteTexture = sprite.texture;
if (spriteTexture == null)
{
return(true);
}
Transform spriteTransform = spriteRenderer.transform;
Vector3 modelSpacePos = spriteTransform.InverseTransformPoint(worldPos);
Vector3 projectedPos = new Plane(Vector3.forward, 0.0f).ProjectPoint(modelSpacePos);
Box modelSpaceBox = spriteRenderer.GetModelSpaceBox();
modelSpaceBox.Size = new Vector3(modelSpaceBox.Size.x, modelSpaceBox.Size.y, 1.0f);
if (!modelSpaceBox.ContainsPoint(projectedPos))
{
return(true);
}
List <Vector3> boxFaceCornerPoints = modelSpaceBox.GetBoxFaceCornerPoints(BoxFace.Front);
Vector3 bottomLeft = boxFaceCornerPoints[(int)BoxFaceCornerPoint.BottomLeft];
Vector3 fromTopLeftToPos = projectedPos - bottomLeft;
Vector2 pixelCoords = new Vector2(fromTopLeftToPos.x * sprite.pixelsPerUnit, fromTopLeftToPos.y * sprite.pixelsPerUnit);
pixelCoords += sprite.textureRectOffset;
try
{
float alpha = spriteTexture.GetPixel((int)(pixelCoords.x + 0.5f), (int)(pixelCoords.y + 0.5f)).a;
return(alpha <= 1e-3f);
}
catch (UnityException e)
{
// Ternary operator needed to avoid 'variable not used' warning
return(e != null ? false : false);
}
}
public bool ContainsPoint(Vector3 point)
{
Vector3 modelSpacePoint = GetPointInModelSpace(point);
return(_modelSpaceBox.ContainsPoint(modelSpacePoint));
}
