QtQuick3D - Colorize model imported from .obj file by the Runtimeloader

[kevin_d]

Hello Folks!
I was upgrading to Qt 6.8/QML and tried to load my .obj - File with QML Syntax.
The Mesh gets loaded, positioned and scaled properly, but it is white.
I need to apply custom colors to the meshes.

This is how i got so far: NOTE: This is not working. Any approach to colorize the Model fails:

      RuntimeLoader {
           id: loader
           source: "Resources/fem_3.obj"
           position: Qt.vector3d(0,1,0)
           scale: Qt.vector3d(5,5,5)

           function applyMaterialToAllModels(node, material) {

               if (typeof node === "undefined") return;

               if (node instanceof Model) {
                   node.material = material;
               } else {
                   // console.log("node type: " + typeof node);
               }
               if (typeof node.children === "undefined") return;
               for (var i = 0; i < node.children.length; i++) {
                   applyMaterialToAllModels(node.children[i], material)
               }
           }

            onStatusChanged:  {

                if (loader.status === RuntimeLoader.Success)
                {
                    console.log("success loading asset file.")

                    var material3 = Qt.createQmlObject( "import QtQuick3D\n" +
                      "DefaultMaterial {\n" +
                       " diffuseColor: \"red\"\n" +
                       "}", loader);
                    material3.diffuseColor = "red";

                    applyMaterialToAllModels(loader, material3);
                }
            }
        }

Can you help me to apply a color?

best regards, kevin_d

[Nils Sjoberg]

Change node.material = material; to node.materials = [material]; because the Model in QtQuick3D has a property called materials (a list), not a single material.