koobas.hobune.stream
Rotating object to face target, while being rotated to match terrain slope
In the image above
the red vector is the spider's forward vector
the blue vector is the vector representing the direction between the spider and it's target
In the code below, orientation is a vector that's representing the normal of the terrain, so that the spider gets aligned to it:
Quaternion rotationNeeded = Quaternion.FromToRotation(Vector3.up, orientation);
transform.rotation = Quaternion.RotateTowards(
transform.rotation,
rotationNeeded,
RotationSpeed * Time.deltaTime
);
My issue is that I cannot manage to make the spider face its target... When I add any code that would make it rotate towards it, then it's not aligned with the terrain's normals...
Best Answer
Found the solution, thanks to stackoverflow and this answer here: https://forum.unity.com/threads/look-at-object-while-aligned-to-surface.515743/ (which solves this issue https://i.imgur.com/NPwHzpx.png)
// target is the player
// transform is the spider
Vector3 orientation = GetTerrainNormal();
Vector3 directionToTarget = (target.position - transform.position).Y(0);
float d = Vector3.Dot(directionToTarget, orientation);
directionToTarget -= d * orientation;
if (directionToTarget.sqrMagnitude > 0.00001f) {
directionToTarget.Normalize();
Quaternion rotationNeeded = Quaternion.LookRotation(directionToTarget, orientation);
transform.rotation = Quaternion.RotateTowards(
transform.rotation,
rotationNeeded,
xRotationSpeed * Time.deltaTime
);
}
Maybe it'll be useful to someone one day :D
