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‎LinePlugin.cs

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#if TOOLS
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using Godot;
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[Tool]
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public partial class LinePlugin : EditorPlugin
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{
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public override void _EnterTree()
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{
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var script = GD.Load<Script>("res://addons/LineRendererCSharp/LineRenderer.cs");
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var texture = GD.Load<Texture2D>("res://addons/LineRendererCSharp/line_render_icon.svg");
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AddCustomType("LineRenderer3D", "MeshInstance3D", script, texture);
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}
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public override void _ExitTree()
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{
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RemoveCustomType("LineRenderer3D");
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}
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}
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#endif

‎LineRenderer.cs

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using Godot;
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using System;
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public partial class LineRenderer : MeshInstance3D {
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[Export]
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public Vector3[] points = [new Vector3(0, 0, 0), new Vector3(0, 5, 0)];
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[Export]
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public float start_thickness = 0.1f;
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[Export]
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public float end_thickness = 0.1f;
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[Export]
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public int corner_resolution = 5;
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[Export]
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public int cap_resolution = 5;
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[Export]
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public bool draw_caps = true;
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[Export]
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public bool draw_corners = true;
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[Export]
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public bool use_global_coords = true;
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[Export]
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public bool tile_texture = true;
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private Camera3D camera;
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private Vector3 cameraOrigin;
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public override void _EnterTree()
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{
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Mesh = new ImmediateMesh();
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}
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public override void _Ready()
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{
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// Initialization code here
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}
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public override void _PhysicsProcess(double delta)
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{
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ImmediateMesh immediateMesh = (ImmediateMesh)Mesh;
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if (points.Length < 2)
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{
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return;
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}
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camera = GetViewport().GetCamera3D();
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if (camera == null)
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{
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return;
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}
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cameraOrigin = ToLocal(camera.GlobalTransform.Origin);
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float progressStep = 1.0f / points.Length;
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float progress = 0;
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float thickness = Mathf.Lerp(start_thickness, end_thickness, progress);
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float nextThickness = Mathf.Lerp(start_thickness, end_thickness, progress + progressStep);
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immediateMesh.ClearSurfaces();
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immediateMesh.SurfaceBegin(Mesh.PrimitiveType.Triangles);
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for (int i = 0; i < points.Length - 1; i++)
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{
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Vector3 A = points[i];
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Vector3 B = points[i + 1];
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if (use_global_coords)
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{
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A = ToLocal(A);
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B = ToLocal(B);
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}
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Vector3 AB = B - A;
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Vector3 orthogonalABStart = (cameraOrigin - ((A + B) / 2)).Cross(AB).Normalized() * thickness;
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Vector3 orthogonalABEnd = (cameraOrigin - ((A + B) / 2)).Cross(AB).Normalized() * nextThickness;
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Vector3 AtoABStart = A + orthogonalABStart;
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Vector3 AfromABStart = A - orthogonalABStart;
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Vector3 BtoABEnd = B + orthogonalABEnd;
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Vector3 BfromABEnd = B - orthogonalABEnd;
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if (i == 0)
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{
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if (draw_caps)
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{
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Cap(A, B, thickness, cap_resolution);
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}
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}
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if (tile_texture)
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{
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float ABLen = AB.Length();
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float ABFloor = Mathf.Floor(ABLen);
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float ABFrac = ABLen - ABFloor;
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immediateMesh.SurfaceSetUV(new Vector2(ABFloor, 0));
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immediateMesh.SurfaceAddVertex(AtoABStart);
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immediateMesh.SurfaceSetUV(new Vector2(-ABFrac, 0));
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immediateMesh.SurfaceAddVertex(BtoABEnd);
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immediateMesh.SurfaceSetUV(new Vector2(ABFloor, 1));
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immediateMesh.SurfaceAddVertex(AfromABStart);
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immediateMesh.SurfaceSetUV(new Vector2(-ABFrac, 0));
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immediateMesh.SurfaceAddVertex(BtoABEnd);
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immediateMesh.SurfaceSetUV(new Vector2(-ABFrac, 1));
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immediateMesh.SurfaceAddVertex(BfromABEnd);
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immediateMesh.SurfaceSetUV(new Vector2(ABFloor, 1));
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immediateMesh.SurfaceAddVertex(AfromABStart);
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}
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else
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{
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immediateMesh.SurfaceSetUV(new Vector2(1, 0));
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immediateMesh.SurfaceAddVertex(AtoABStart);
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immediateMesh.SurfaceSetUV(new Vector2(0, 0));
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immediateMesh.SurfaceAddVertex(BtoABEnd);
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immediateMesh.SurfaceSetUV(new Vector2(1, 1));
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immediateMesh.SurfaceAddVertex(AfromABStart);
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immediateMesh.SurfaceSetUV(new Vector2(0, 0));
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immediateMesh.SurfaceAddVertex(BtoABEnd);
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immediateMesh.SurfaceSetUV(new Vector2(0, 1));
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immediateMesh.SurfaceAddVertex(BfromABEnd);
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immediateMesh.SurfaceSetUV(new Vector2(1, 1));
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immediateMesh.SurfaceAddVertex(AfromABStart);
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}
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if (i == points.Length - 2)
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{
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if (draw_caps)
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{
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Cap(B, A, nextThickness, cap_resolution);
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}
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}
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else
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{
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if (draw_corners)
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{
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Vector3 C = points[i + 2];
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if (use_global_coords)
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{
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C = ToLocal(C);
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}
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Vector3 BC = C - B;
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Vector3 orthogonalBCStart = (cameraOrigin - ((B + C) / 2)).Cross(BC).Normalized() * nextThickness;
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float angleDot = AB.Dot(orthogonalBCStart);
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if (angleDot > 0 && !Mathf.IsEqualApprox(angleDot, 1))
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{
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Corner(B, BtoABEnd, B + orthogonalBCStart, corner_resolution);
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}
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else if (angleDot < 0 && !Mathf.IsEqualApprox(angleDot, -1))
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{
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Corner(B, B - orthogonalBCStart, BfromABEnd, corner_resolution);
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}
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}
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}
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progress += progressStep;
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thickness = Mathf.Lerp(start_thickness, end_thickness, progress);
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nextThickness = Mathf.Lerp(start_thickness, end_thickness, progress + progressStep);
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}
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immediateMesh.SurfaceEnd();
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}
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private void Cap(Vector3 center, Vector3 pivot, float thickness, int cap_resolution)
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{
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ImmediateMesh immediateMesh = (ImmediateMesh)Mesh;
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Vector3 orthogonal = (cameraOrigin - center).Cross(center - pivot).Normalized() * thickness;
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Vector3 axis = (center - cameraOrigin).Normalized();
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Vector3[] vertexArray = new Vector3[cap_resolution + 1];
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for (int i = 0; i < cap_resolution + 1; i++)
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{
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vertexArray[i] = new Vector3(0, 0, 0);
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}
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vertexArray[0] = center + orthogonal;
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vertexArray[cap_resolution] = center - orthogonal;
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for (int i = 1; i < cap_resolution; i++)
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{
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vertexArray[i] = center + (orthogonal.Rotated(axis, Mathf.Lerp(0.0f, Mathf.Pi, (float)i / cap_resolution)));
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}
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for (int i = 1; i < cap_resolution + 1; i++)
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{
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immediateMesh.SurfaceSetUV(new Vector2(0, (i - 1) / (float)cap_resolution));
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immediateMesh.SurfaceAddVertex(vertexArray[i - 1]);
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immediateMesh.SurfaceSetUV(new Vector2(0, (i - 1) / (float)cap_resolution));
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immediateMesh.SurfaceAddVertex(vertexArray[i]);
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immediateMesh.SurfaceSetUV(new Vector2(0.5f, 0.5f));
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immediateMesh.SurfaceAddVertex(center);
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}
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}
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private void Corner(Vector3 center, Vector3 start, Vector3 end, int cap_resolution)
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{
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ImmediateMesh immediateMesh = (ImmediateMesh)Mesh;
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Vector3[] vertexArray = new Vector3[cap_resolution + 1];
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for (int i = 0; i < cap_resolution + 1; i++)
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{
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vertexArray[i] = new Vector3(0, 0, 0);
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}
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vertexArray[0] = start;
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vertexArray[cap_resolution] = end;
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Vector3 axis = start.Cross(end).Normalized();
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Vector3 offset = start - center;
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float angle = offset.AngleTo(end - center);
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for (int i = 1; i < cap_resolution; i++)
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{
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vertexArray[i] = center + offset.Rotated(axis, Mathf.Lerp(0.0f, angle, (float)i / cap_resolution));
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}
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for (int i = 1; i < cap_resolution + 1; i++)
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{
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immediateMesh.SurfaceSetUV(new Vector2(0, (i - 1) / (float)cap_resolution));
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immediateMesh.SurfaceAddVertex(vertexArray[i - 1]);
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immediateMesh.SurfaceSetUV(new Vector2(0, (i - 1) / (float)cap_resolution));
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immediateMesh.SurfaceAddVertex(vertexArray[i]);
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immediateMesh.SurfaceSetUV(new Vector2(0.5f, 0.5f));
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immediateMesh.SurfaceAddVertex(center);
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}
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}
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}

‎line_render_icon.svg

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