forked from bit/DotRecastNetSim
76 lines
3.0 KiB
C#
76 lines
3.0 KiB
C#
using DotRecast.Core;
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using static DotRecast.Core.RcMath;
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using static DotRecast.Recast.Toolset.Tools.Gizmos.GizmoHelper;
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namespace DotRecast.Recast.Toolset.Tools.Gizmos
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{
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public class CylinderGizmo : IRcGizmoMeshFilter
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{
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public readonly float[] vertices;
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public readonly int[] triangles;
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public readonly RcVec3f center;
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public readonly float[] gradient;
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public CylinderGizmo(RcVec3f start, RcVec3f end, float radius)
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{
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center = RcVec3f.Of(
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0.5f * (start.x + end.x), 0.5f * (start.y + end.y),
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0.5f * (start.z + end.z)
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);
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RcVec3f axis = RcVec3f.Of(end.x - start.x, end.y - start.y, end.z - start.z);
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RcVec3f[] normals = new RcVec3f[3];
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normals[1] = RcVec3f.Of(end.x - start.x, end.y - start.y, end.z - start.z);
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RcVec3f.Normalize(ref normals[1]);
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normals[0] = GetSideVector(axis);
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normals[2] = RcVec3f.Zero;
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RcVec3f.Cross(ref normals[2], normals[0], normals[1]);
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RcVec3f.Normalize(ref normals[2]);
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triangles = GenerateCylindricalTriangles();
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RcVec3f trX = RcVec3f.Of(normals[0].x, normals[1].x, normals[2].x);
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RcVec3f trY = RcVec3f.Of(normals[0].y, normals[1].y, normals[2].y);
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RcVec3f trZ = RcVec3f.Of(normals[0].z, normals[1].z, normals[2].z);
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vertices = GenerateCylindricalVertices();
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float halfLength = 0.5f * axis.Length();
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gradient = new float[vertices.Length / 3];
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RcVec3f v = new RcVec3f();
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for (int i = 0; i < vertices.Length; i += 3)
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{
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float offset = (i >= vertices.Length / 2) ? -halfLength : halfLength;
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float x = radius * vertices[i];
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float y = vertices[i + 1] + offset;
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float z = radius * vertices[i + 2];
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vertices[i] = x * trX.x + y * trX.y + z * trX.z + center.x;
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vertices[i + 1] = x * trY.x + y * trY.y + z * trY.z + center.y;
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vertices[i + 2] = x * trZ.x + y * trZ.y + z * trZ.z + center.z;
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if (i < vertices.Length / 4 || i >= 3 * vertices.Length / 4)
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{
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gradient[i / 3] = 1;
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}
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else
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{
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v.x = vertices[i] - center.x;
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v.y = vertices[i + 1] - center.y;
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v.z = vertices[i + 2] - center.z;
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RcVec3f.Normalize(ref v);
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gradient[i / 3] = Clamp(0.57735026f * (v.x + v.y + v.z), -1, 1);
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}
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}
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}
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private RcVec3f GetSideVector(RcVec3f axis)
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{
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RcVec3f side = RcVec3f.Of(1, 0, 0);
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if (axis.x > 0.8)
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{
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side = RcVec3f.Of(0, 0, 1);
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}
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RcVec3f forward = new RcVec3f();
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RcVec3f.Cross(ref forward, side, axis);
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RcVec3f.Cross(ref side, axis, forward);
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RcVec3f.Normalize(ref side);
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return side;
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}
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}
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} |