81 lines
3.0 KiB
C#
81 lines
3.0 KiB
C#
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#if UNITY_EDITOR
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using UnityEngine;
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using System.Collections.Generic;
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namespace GSpawn
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{
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public enum QuadCorner
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{
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TopLeft = 0,
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TopRight,
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BottomRight,
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BottomLeft
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}
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public static class Quad3D
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{
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public static void calcCorners(Vector3 quadCenter, Vector2 quadSize, Quaternion quadRotation, List<Vector3> corners)
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{
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corners.Clear();
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Vector3 u = quadRotation * Vector3.right;
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Vector3 v = quadRotation * Vector3.up;
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Vector3 extents = quadSize * 0.5f;
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corners.Add(quadCenter - u * extents.x + v * extents.y);
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corners.Add(quadCenter + u * extents.x + v * extents.y);
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corners.Add(quadCenter + u * extents.x - v * extents.y);
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corners.Add(quadCenter - u * extents.x - v * extents.y);
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}
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public static Vector3 calcCorner(Vector3 quadCenter, Vector2 quadSize, Quaternion quadRotation, QuadCorner quadCorner)
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{
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Vector3 u = quadRotation * Vector3.right;
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Vector3 v = quadRotation * Vector3.up;
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Vector3 extents = quadSize * 0.5f;
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if (quadCorner == QuadCorner.TopLeft) return quadCenter - u * extents.x + v * extents.y;
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else if (quadCorner == QuadCorner.TopRight) return quadCenter + u * extents.x + v * extents.y;
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else if (quadCorner == QuadCorner.BottomRight) return quadCenter + u * extents.x - v * extents.y;
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return quadCenter - u * extents.x - v * extents.y;
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}
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public static OBB calcOBB(Vector3 quadCenter, Vector2 quadSize, Quaternion quadRotation)
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{
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Vector3 size = quadSize;
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return new OBB(quadCenter, size, quadRotation);
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}
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public static bool raycast(Ray ray, out float t, Vector3 quadCenter, float quadWidth, float quadHeight, Vector3 quadU, Vector3 quadV)
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{
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t = 0.0f;
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Vector3 quadNormal = Vector3.Normalize(Vector3.Cross(quadU, quadV));
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Plane quadPlane = new Plane(quadNormal, quadCenter);
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float rayEnter;
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if (quadPlane.Raycast(ray, out rayEnter) &&
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containsPoint(ray.GetPoint(rayEnter), false, quadCenter, quadWidth, quadHeight, quadU, quadV))
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{
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t = rayEnter;
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return true;
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}
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return false;
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}
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public static bool containsPoint(Vector3 point, bool checkOnPlane, Vector3 quadCenter, float quadWidth, float quadHeight, Vector3 quadU, Vector3 quadV)
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{
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Plane quadPlane = new Plane(Vector3.Cross(quadU, quadV).normalized, quadCenter);
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if (checkOnPlane && quadPlane.absDistanceToPoint(point) > 1e-5f) return false;
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Vector3 toPoint = point - quadCenter;
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float dotRight = toPoint.absDot(quadU);
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float dotUp = toPoint.absDot(quadV);
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if (dotRight > quadWidth * 0.5f) return false;
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if (dotUp > quadHeight * 0.5f) return false;
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return true;
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}
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}
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}
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#endif
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