/// <summary>
/// Create Physics Object.
/// </summary>
/// <param name="position"></param>
/// <param name="spread"></param>
/// <param name="densityIndex"></param>
/// <param name="prototype"></param>
internal UNPhysicsObject(UNPhysicsTemplate template, FoliageMeshInstance meshInstance)
{
Bounds = new Bounds();
_enabled = true;
transform = Matrix4x4.identity;
CalculateTransform(0, 0, 0, template, meshInstance);
}
/// <summary>
/// Calculate the transform matrix.
/// </summary>
internal void CalculateTransform(float x, float y, float z, UNPhysicsTemplate template, FoliageMeshInstance meshInstance)
{
Vector3 position;
// position
position.x = template.position.x + (template.spread.x * template.prototype.spread) + x + meshInstance.position.x;
position.y = template.position.y + y;
position.z = template.position.z + (template.spread.y * template.prototype.spread) + z + meshInstance.position.z;
// rotation
Quaternion randomRotation = Quaternion.Euler(0, template.spread.x * 360, 0);
// scale
float widthSizeDifference = template.prototype.maximumWidth - template.prototype.minimumWidth;
widthSizeDifference *= template.spread.x;
float widthSize = template.prototype.minimumWidth + widthSizeDifference;
float heightSizeDifference = template.prototype.maximumHeight - template.prototype.minimumHeight;
widthSizeDifference *= template.spread.x;
float heightSize = template.prototype.minimumHeight + heightSizeDifference;
Vector3 width_height_scale = new Vector3(widthSize, heightSize, widthSize);
Vector3 worldScale = template.prototype.FoliageInstancedMeshData.worldScale;
worldScale.Scale(width_height_scale);
transform = Matrix4x4.TRS(position, randomRotation, worldScale);
UpdateBounds();
}