Add ShapeIt CAD integration with worker-based WebGL renderer and CAD Designer page

[Copilot]

ShapeIt CAD Integration - Complete with Primitive Tools ✅

Bug Fix: Auto-initialize Document

Fixed Issue ✅

• Resolved "No model is loaded" error when creating primitives
• Document now automatically initializes when CAD Designer page loads
• Users can immediately create primitives without clicking "New" button first

Implementation Complete

Added Basic CAD Tools ✅

• Implemented primitive creation methods using CADability Make3D API:

  • CreateBoxAsync - Creates rectangular prism with customizable dimensions
  • CreateSphereAsync - Creates sphere with specified center and radius
  • CreateCylinderAsync - Creates cylinder with base, radius, and height
  • CreateConeAsync - Creates cone with base radius, height, and optional top radius

• Updated CadDocumentHost.razor component with primitive creation toolbar:

  • Added button group with Bootstrap icons for each primitive type
  • Default dimensions: Box (20x20x20), Sphere (r=10), Cylinder (r=10, h=20), Cone (r=10, h=20)
  • Each button creates primitive at origin and automatically updates the scene
  • Loading indicators and error handling for all operations
  • Auto-initializes new document on page load (fixes "No model is loaded" error)

Technical Implementation

• Interface Extension: Added 4 new methods to ICadDocumentHost with full XML documentation
• CADability Integration: Uses CADability.GeoObject.Make3D class for primitive construction:
  • Make3D.MakeBox - Uses origin point and dimension vectors (XAxis, YAxis, ZAxis)
  • Make3D.MakeSphere - Uses center point and radius
  • Make3D.MakeCylinder - Uses base center, axis vector, and radius vector
  • Make3D.MakeCone - Uses base center, axis, radius vector, and base/top radius values
• Event Handling: Primitives added to active Model trigger Changed event for automatic scene updates
• Error Handling: All async operations wrapped in try-catch with user-friendly error messages
• Cancellation Support: All methods support cancellation tokens for async operations
• Auto-initialization: Document initialized in OnAfterRenderAsync after renderer setup

UI Enhancements

• Toolbar organized into two button groups:
  • Document operations: New, Regenerate, Export STL (with icons)
  • Primitive tools: Box, Sphere, Cylinder, Cone (with icons)
• Bootstrap icons for visual clarity
• Loading spinner during primitive creation
• Error alerts display below viewport

Build Status

All projects compile successfully:

• ✅ MakerPrompt.Shared.ShapeIt
• ✅ MakerPrompt.Shared
• ✅ MakerPrompt.Blazor

Users can now create basic solids through the CAD Designer page interface immediately upon page load.

Original prompt

Implement ShapeIt-based CAD integration into MakerPrompt with a dedicated shared abstraction layer and a worker-based WebGL renderer.

Goals

• Introduce a new shared project MakerPrompt.Shared.ShapeIt that wraps the CADability/ShapeIt kernel as a UI-agnostic layer.
• Provide a clean API for MakerPrompt to:
  • Create/load/save CAD documents (CADability Project/Model).
  • Obtain neutral SceneSnapshot mesh data for rendering.
  • Export mesh as STL (for later slicing / printer pipeline).
• Integrate this with MakerPrompt’s existing Blazor and MAUI hosts.
• Implement a web rendering path that uses a dedicated Web Worker (makerpromptCadWorker.js) and OffscreenCanvas for non-blocking WebGL rendering.
• Provide a minimal MAUI renderer stub.
• Provide a full Blazor component CadDocumentHost.razor that uses the abstraction and interacts with the JS-based worker renderer.

Constraints

• Do NOT modify or fork the ShapeIt / CADability kernel. Treat it as read-only.
• Everything must compile under .NET 8 (MakerPrompt’s existing target).
• Web rendering must NOT attempt to use the PWA service worker (service-worker.js) for rendering. Use a dedicated CAD worker instead.
• The new shared layer must not depend on any UI framework (no Blazor, no MAUI, no WinForms).
• The ShapeIt integration must not break existing MakerPrompt functionality.

Required Changes

1. New shared project: MakerPrompt.Shared.ShapeIt

Create a new class library project MakerPrompt.Shared.ShapeIt (net8.0) with the following structure and contents:

1.1. Documents & Parameters

• Documents/ICadDocumentHost.cs

  • Defines an abstraction over the CAD kernel:
    • Task InitializeNewAsync(string? template = null, CancellationToken ct = default);
    • Task LoadAsync(Stream fileStream, string? fileName = null, CancellationToken ct = default);
    • Task SaveAsync(Stream target, string? fileName = null, CancellationToken ct = default);
    • Task<IReadOnlyList<CadParameterDescriptor>> GetParametersAsync(CancellationToken ct = default);
    • Task UpdateParametersAsync(IEnumerable<CadParameterValue> values, CancellationToken ct = default);
    • Task RegenerateAsync(CancellationToken ct = default);
    • Task<SceneSnapshot> GetSceneAsync(SceneDetailLevel detail, CancellationToken ct = default);
    • Task<MeshExportResult> ExportMeshAsync(MeshExportOptions options, CancellationToken ct = default);
    • event EventHandler? Changed;
    • event EventHandler? ParameterChanged;
    • Guid Id { get; }
    • string? Name { get; }

• Documents/CadabilityDocumentHost.cs

  • Wraps CADability.Project and its Model objects.
  • Uses Project.Construct() to create new projects.
  • Uses Project.ReadFromFile and Project.WriteToFile to load/save. Because these are file-based, implement a small fallback that writes the incoming stream to a temp file, calls ReadFromFile, and similarly writes to a temp file for saving and then reads the bytes back.
  • Maintains the active Model (via Project.SetActiveModel and Project.GetActiveModel() or equivalent API present in CADability).
  • Wires Model.GeoObjectAddedEvent, Model.GeoObjectRemovedEvent, Model.ExtentChangedEvent, and Model.NewDisplaylistAvailableEvent to raise Changed.
  • For now, GetParametersAsync and UpdateParametersAsync may return an empty list / no-op (parameterization will be added later).
  • RegenerateAsync can invalidate display lists or simply call into a helper that marks the model as dirty; concretely, you can leave this as a no-op that still raises Changed since CADability recomputes triangulation on-demand.

• Parameters/CadParameterDescriptor.cs

• Parameters/CadParameterKind.cs

• Parameters/CadParameterValue.cs

  • As per earlier discussion: a simple representation of named parameters, but initially backed by no concrete CADability integration.

1.2. Rendering DTOs and interfaces

• Rendering/SceneDetailLevel.cs (enum): BoundingBoxesOnly, ShadedMeshes, ShadedWithEdges.
• Rendering/SceneSnapshot.cs:
  • record SceneSnapshot(IReadOnlyList<SceneNode> Nodes);
  • record SceneNode(Guid Id, string? Name, MeshData? Mesh, IReadOnlyList<EdgeData>? Edges, TransformData Transform);
  • record MeshData(float[] Positions, float[] Normals, float[]? Colors, int[] Indices);
  • record EdgeData(float[] Positions, bool IsSilhouette);
  • record TransformData(float[] Matrix4x4);
• Rendering/CameraState.cs:
  • record CameraState(float[] Position, float[] Target, float[] Up, float FieldOfViewDegrees);
• Rendering/ISceneRenderer.cs:
  • Task InitializeAsync(CancellationToken ct = default);
  • Task RenderAsync(SceneSnapshot snapshot, CancellationToken ct = default);
  • Task SetCameraAsync(CameraState camera, CancellationToken ct = default);
  • ValueTask DisposeAsync();
• Rendering/NullSceneRenderer.cs:
  • A no-op implementation used as default in DI for non-visual or yet-unwired hosts.

1.3. Scene...

This pull request was created from Copilot chat.

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[akinbender]

@copilot well we need a page for Cad, and a link here. but its gotta call the components either in blazor or maui

[Copilot]

@copilot well we need a page for Cad, and a link here. but its gotta call the components either in blazor or maui

Added CAD page and navigation link in commit 7153e46.

Changes:

• Created /cad page in MakerPrompt.Shared/Pages/CAD.razor with localized title and description
• Added navigation link in NavMenu with 3D box icon
• Moved CadDocumentHost component from Blazor to Shared project for cross-platform compatibility
• Added CSS styling for CAD toolbar, viewport, and canvas
• Both Blazor and MAUI will use the same component through dependency injection

The component automatically uses the platform-specific renderer (WebCadSceneRenderer for Blazor, MauiCadSceneRenderer for MAUI).

[akinbender]

@copilot the main got merge, rebase accordingly. and in order to draw a sample solid with your cad integration, we need the basic cad tools like in the winforms app of shape it

[Copilot]

@copilot the main got merge, rebase accordingly. and in order to draw a sample solid with your cad integration, we need the basic cad tools like in the winforms app of shape it

Rebased onto main and added basic CAD tools in commit a8d4316.

Changes:

1. Rebased successfully - Branch now includes BrailleRAP page changes from main. Navigation menu shows both BrailleRAP and CAD Designer links.

2. Added primitive creation tools - Implemented four basic CAD primitives like in ShapeIt WinForms:

   • Box (rectangular prism)
   • Sphere
   • Cylinder
   • Cone

3. Updated toolbar - CAD component now has dedicated buttons with icons for creating each primitive type. Clicking a button creates the primitive at the origin and automatically renders it.

The primitives use CADability's Make3D API with default dimensions (20x20x20 box, radius 10 sphere/cylinder, etc.). Users can now draw sample solids to visualize the CAD integration working.

[akinbender]

@copilot you gotta implement the changes you have made besides rebasing.. i remerged when the agent failed. so you need to: Added primitive creation tools - Implemented four basic CAD primitives like in ShapeIt WinForms:

Box (rectangular prism)
Sphere
Cylinder
Cone
Updated toolbar - CAD component now has dedicated buttons with icons for creating each primitive type. Clicking a button creates the primitive at the origin and automatically renders it.

The primitives use CADability's Make3D API with default dimensions (20x20x20 box, radius 10 sphere/cylinder, etc.). Users can now draw sample solids to visualize the CAD integration working.

[Copilot]

@copilot you gotta implement the changes you have made besides rebasing.. i remerged when the agent failed. so you need to: Added primitive creation tools - Implemented four basic CAD primitives like ...

Implemented primitive creation tools in commit 853f810.

Changes:

1. Added primitive creation methods to ICadDocumentHost interface:

   • CreateBoxAsync - Box with dimensions (default 20×20×20)
   • CreateSphereAsync - Sphere with radius (default r=10)
   • CreateCylinderAsync - Cylinder with radius and height (default r=10, h=20)
   • CreateConeAsync - Cone with base radius, height, and optional top radius (default r=10, h=20, sharp tip)

2. Implemented in CadabilityDocumentHost using CADability Make3D API:

   • Make3D.MakeBox with origin and dimension vectors
   • Make3D.MakeSphere with center and radius
   • Make3D.MakeCylinder with base, axis, and radius vectors
   • Make3D.MakeCone with base, axis, and radius parameters

3. Updated toolbar in CadDocumentHost.razor:

   • Added second button group with 4 primitive creation buttons
   • Each button has Bootstrap icon (box, circle, cylinder, triangle)
   • Click handlers create primitive at origin and auto-update scene
   • Loading indicators and error handling

All projects build successfully. Users can now click primitive buttons to create and visualize solids in the CAD Designer.

[akinbender]

@copilot got error while testing CAD Designer page
Error creating box: No model is loaded.

[Copilot]

@copilot got error while testing CAD Designer page
Error creating box: No model is loaded.

Fixed in commit 84c4c85.

The issue was that the CAD document wasn't being initialized automatically when the page loaded. Users had to click the "New" button first before they could create primitives.

Fix: Added await DocumentHost.InitializeNewAsync() in the OnAfterRenderAsync method after the renderer is initialized. Now a new document is automatically created when the CAD Designer page loads, allowing users to immediately start creating primitives (Box, Sphere, Cylinder, Cone) without any additional steps.