assignment 3

Looking at the bank above you can see that the sides are bumpy and the top is smooth.

Now you will see how the model of assignment 2 is changed to look like more realistic.

bump mapping

The easiest way to get a bumpy effect for a flat surface is the bump mapping technique.

Applying this technique to the texture

of the model of assignment 2 leads to the following results:

The next two pictures show the scene at daytime and by night.

Now, on the next two pictures you can see the same scenes rendered with the bumped texture. In the program you can enable bump mapping by clicking on the checkbox on the right side of the panel.

UV and normal maps

Another way to make the scene look like more realistic is using UV maps and normal maps.
For a planar surface (for example a polygon of the roof of the bus shelter) you can change the normals of this surface and then creating a texture out of the changed surface.

Changing the normals of a planar surface can lead to the following model:

Now you can either store the normals as a normal map and then applying a texture and the normal map to a polygon or you can put a texture directly on the changed surface,

creating a texture by exporting the normal map as UV texture:

(of course you will not have the lines of the polygon on the texture - this is only to show the UV map)

Other examples:

Now these textures can be applied to the polygon.

Ok, this does not look realistic, but it is only to show the principle :-)