Custom Geometry

// Create a custom mesh (triangle)
const customMesh = new BABYLON.Mesh("custom", scene);

// Define vertex data
const vertexData = new BABYLON.VertexData();

// Positions (3 vertices, each with x,y,z coordinates)
vertexData.positions = [
    0, 1, 0,    // Top vertex
    -1, -1, 0,  // Bottom left vertex
    1, -1, 0    // Bottom right vertex
];

// Indices (defines triangles using position indices)
vertexData.indices = [0, 1, 2]; // Counter-clockwise winding

// Normals (perpendicular vectors for lighting calculations)
vertexData.normals = [
    0, 0, 1,
    0, 0, 1,
    0, 0, 1
];

// UV coordinates for texturing
vertexData.uvs = [
    0.5, 0,   // Top vertex UV
    0, 1,     // Bottom left UV
    1, 1      // Bottom right UV
];

// Apply the vertex data to the mesh
vertexData.applyToMesh(customMesh);