Question

I create a model (cube) and add that to my viewport and it works properly without any problem.

this.mainViewport.Children.Add(model);

whenever I use the following code, the cube become black instead of it’s original color.

this.mainViewport.Children.Clear();
this.mainViewport.Children.Add(model);

I need to clear the viewport as I am adding the cube in another position in next second. any suggestion to solve that problem would be highly appreciated.

Answer 1

I would do something like this instead :
Create the Cube first time in it start location :

ModelVisual3D model = new ModelVisual3D();
model.Content = cube;

Then in the timer I would change the Transform wit the new location:

model.Transform = new TranslateTransform3D(X, Y, Z); // model need to be a field in your class

The other available transorms are :

1. ScaleTransform3D

2. RotateTransform3D

3. MatrixTransform3D

4. Transform3DGroup