Model prototype

[AVinitzca]

No description provided.

[Copilot]

Pull Request Overview

This PR introduces a model rendering prototype that enables loading and displaying complex 3D models, specifically the Sponza cathedral scene. The implementation provides a flexible architecture for extracting, transforming, and rendering geometry from MonoGame models with support for texture mapping and spatial transformations.

Key Changes:

• New ModelExtensions API with multiple extraction methods (standard, merged, centered, and XZ-centered variants)
• Geometry abstraction layer (Geometry, GeometryData, ModelInfo) for simplified model rendering
• Sponza cathedral sample demonstrating the new rendering pipeline

Reviewed Changes

Copilot reviewed 32 out of 32 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
Samples/Models/Sponza.cs	Sample implementation showcasing Sponza model rendering using the new ModelExtensions API
Models/ModelInfo.cs	Container class managing geometry data collections with proper disposal
Models/ModelExtensions.cs	Core extension methods for extracting and transforming model geometry with various centering options
Models/GeometryData.cs	Struct bundling geometry, transformation matrix, and textures for rendering
Models/Geometry.cs	Wrapper class for vertex/index buffers with ownership tracking and drawing functionality
Content/Effects/BasicTexture.fx	Shader for textured model rendering with world/view/projection transforms
Content/Content.mgcb	Content pipeline configuration adding Sponza model and BasicTexture effect
Content/3D/sponza/*	Sponza model assets and textures (binary files tracked via Git LFS)

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[Copilot]

The vertexCount variable is initialized to 0 but is immediately reassigned in loops at lines 333, 355, and 387 without being used. This causes incorrect vertex counting as previous loop increments are overwritten. Remove the redundant reassignments at lines 355 and 387.