Cinema 4D is a high-level 3D modelling, rendering and animation application offered by the Maxon corporation. It has features and abilities that rival some of the other major players in the field, such as Maya or 3D Max. While you can export the content you create in Cinema 4D to other applications, one of the useful things about doing everything from creation to render inside Cinema 4D itself is that you can take some shortcuts. For example, if you would like to have a simple solar panel on a house in a scene, you don't have to actually create a model and UV map it for a texture.
Go online and download an image of a solar panel you would like to use. The panel should not be at an angle in the image.
Start Cinema 4D. Click on the "Cube" icon at the top to place it in the scene.
Click on the "Make Editable" button at the top of the left panel. In that same panel, choose the "Polygon Selection" tool.
Click on all of the polygon faces of the cube and delete them, except the one facing forward.
Go the "Materials" panel at the bottom. Select "File" and choose "New Material." Under the "Color" tab in the dialogue that pops up, click on the "Browse" button next to "Texture." Go to the image you loaded and open it. Click on the "X" to close the dialogue.
Drag the new texture from the "Materials" panel onto the polygon to apply it. Select "Scale" from the top and use the handles that appear to resize the polygon until the panel is the same proportion it was before. Save your work.