Builder.h

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#pragma once
 
#include "virtualgeometry/VirtualGeometryAsset.h"
 
#include <cstdint>
 
namespace eve::virtualgeometry {
 
class VirtualGeometryBuilder {
public:
    struct MeshInput {
        int vertexCount = 0;
        const float *positions = nullptr;  // xyz packed
        const float *normals = nullptr;    // optional xyz packed
        const std::uint32_t *indices = nullptr;  // triangle list (count % 3 == 0)
        int indexCount = 0;
    };
 
    struct Options {
        int maxVerticesPerCluster = 64;   // ~Nanite 128 tris / 64-96 verts
        int maxTrianglesPerCluster = 124;
        int minLodLevels = 4;             // build at least this many levels
        int mergeFactor = 4;              // clusters merged into one parent
        float lodTargetRatio = 0.5f;      // parent keeps this fraction of triangles
    };
 
    bool build(const MeshInput &in, const Options &opt, VirtualGeometryAsset &out);
};
 
}  // namespace eve::virtualgeometry