Troubles encountered while processing STL file readers

Utilizing STLLoader.js, I am able to render components successfully, however, they all appear with one uniform color which does not resemble real-world components.

The image above showcases my implementation in Three.js using STLLoader.js (Binary STL file utilized) as it supports colors for the components.

The image below displays a component rendered in one of my windows software using a Step file. I aim to render components that closely resemble those shown in the image below to achieve a more realistic look.

Is there a method to achieve correct colored output in three.js? Despite extensive research, I have been unable to find a suitable solution. Any assistance in guiding me towards progress would be greatly appreciated.

        var loader = new THREE.STLLoader();
        loader.addEventListener( 'load', function ( event ) {               
            var material = new THREE.MeshPhongMaterial( { color: 0x75D3DC, ambient: 0x75D3DC, specular: 0x75D3DC, shininess: 200/*, vertexColors: THREE.VertexColors */} );

            var mesh = new THREE.Mesh( geometry, material );
            mesh.position.x = x - boardMaxX + w/2 ;
            mesh.position.y = - 5 ;
            mesh.position.z = z - boardMaxY + h/2 ;

            mesh.rotation.set( (rotation * Math.PI / 180.0), 0, 0 );

            mesh.scale.set(2, 2, 2);

            mesh.castShadow = true;
            mesh.receiveShadow = true;
            board.add(mesh);
            objects.push( mesh );

            i = i + 5;
            componenetDraw(componentArray[i] * scaleX, -7, componentArray[i + 1] * scaleY, componentArray[i + 2], componentArray[i + 4]);
        } );

    loader.load( fileName );
    }

The provided code is used to read STL files, but I currently lack the necessary code to read STEP files.

Answer №1

When working with STEP files, it's important to note that they typically include BREP geometry which requires utilizing a CAD kernel for conversion to mesh format. Some excellent options for CAD kernels include BRL-CAD, FreeCAD, pythonOCC, and OCE/OCCT. And don't forget about meshlab for seamlessly converting those meshes.

Answer №2

In order to accurately specify color per triangle-set, it is essential to select a file format that supports this functionality, rather than just per mesh. One viable option for achieving this is through the use of VRML, which can be easily exported using FreeCAD.

Another alternative approach would involve dividing your part into distinct sections and exporting each color region as its own individual mesh with a single designated color.

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