54 lines
2.1 KiB
C#
54 lines
2.1 KiB
C#
using UnityEngine;
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using System.Collections;
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using RootMotion.FinalIK;
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namespace RootMotion.Demos {
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/// <summary>
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/// Raycasting to the ground to redirect upper-body animation based on ground topography.
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/// </summary>
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public class TerrainOffset : MonoBehaviour {
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public AimIK aimIK; // Reference to the AimIK component
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public Vector3 raycastOffset = new Vector3(0f, 2f, 1.5f); // Offset from the character, in local space, to raycast from
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public LayerMask raycastLayers; // The layers we want to raycast at
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public float min = -2f, max = 2f; // Min and max for the offset
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public float lerpSpeed = 10f; // The speed of lerping the IKPosition to make things nice and smooth
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private RaycastHit hit;
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private Vector3 offset;
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void LateUpdate() {
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// Find the raycastOffset in world space
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Vector3 worldOffset = transform.rotation * raycastOffset;
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// Find how much higher is the ground at worldOffset relative to the character position.
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Vector3 realOffset = GetGroundHeightOffset(transform.position + worldOffset);
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// Smoothly lerp the offset value so it would not jump on sudden raycast changes
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offset = Vector3.Lerp(offset, realOffset, Time.deltaTime * lerpSpeed);
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// The default offset point at the character's height
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Vector3 zeroOffsetPosition = transform.position + new Vector3(worldOffset.x, 0f, worldOffset.z);
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// Make the Aim Transform look at the default offset point (So when we are on planar ground there will be nothing for Aim IK to do)
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aimIK.solver.transform.LookAt(zeroOffsetPosition);
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// Make Aim IK bend the spine by the offset.
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aimIK.solver.IKPosition = zeroOffsetPosition + offset;
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}
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private Vector3 GetGroundHeightOffset(Vector3 worldPosition) {
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// Visualize the raycast
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Debug.DrawRay(worldPosition, Vector3.down * raycastOffset.y * 2f, Color.green);
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// Raycast to find how much higher is the ground at worldPosition relative to the character.
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if (Physics.Raycast(worldPosition, Vector3.down, out hit, raycastOffset.y * 2f)) {
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return Mathf.Clamp(hit.point.y - transform.position.y, min, max) * Vector3.up;
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}
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// Raycast found nothing so return zero
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return Vector3.zero;
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}
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}
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}
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