In order to make a 3d picture of a room, you will need to use a 3d rendering program. There are many different types of 3d rendering programs available, so you will need to choose one that is compatible with your computer. Once you have chosen a program, you will need to create a 3d model of the room. This can be done by either importing a 2d image of the room or by manually creating the 3d model. Once you have created the 3d model, you will need to render it. This can be done by either using a ray tracing program or by using a rasterizer.