I'm not so familiar with 3D modelling, and I'm stuck on a simple task in Blender.
I have a fairly complex model that's been imported as a .DAE file from SketchUp. This model is composed of many polygons, not as one single mesh but in many components, in fact over many hundreds of surfaces.
As I said I'm new to Blender and want to learn. If I select one of the component surfaces, I can go into Edit mode and then use the Decimate modifier to reduce the poly-count.
But it doesn't want to let me do this if I select the whole object!
I think I need to combine all the surfaces into one mesh (?) and then apply the Decimate algorithm to gracefully reduce the poly-count.
I've managed to do this before but unfortunately I forgot how and I need to try again to get the balance right on the poly-count.
Appreciate the help.