#24 - Materials - Modelling Techniques 6

Here I will demonstrate using the tools explained in the penultimate exercise worksheet for this assignment. I tried using various projection types on three different objects (cylinder, cube and sphere) and will note the differences here. The most unusual one in my opinion is the perspective projection type, which is clearly not designed for a specific primitive shape but more a landscape which goes all the way into the distance, as the tiles get smaller and smaller the further it goes. In fact, it makes this cylinder look bottomless.
The concentric type is the other option that appears to be designed not for a 3D shape but more as a pattern for whichever 3D shape. In fact, it seems to fit equally well with each of the three shapes, however when I tried moving them I noticed that the pattern actually stays where it is, and new pattern appear in the direction the shape is moving, as if the concentric projection is covering the entire scene from all directions, seen from wherever the camera is and only if an object is present. This could be really useful for some sort of randomly generated level with no set end. The pattern will just keep appearing where there are objects with it turned on for their materials. If you put the objects together you can see that the texture is the same on both objects in any one place.

As for the other projection types, they just appear most suitable if they are on the object for which they are named. If they are on a different object however, you can clearly see which object they were designed for based on the shape of the checkers. For example, the projection type on this sphere is intended for a cube, and the projection type on the cylinder is right for the cylinder. In some cases the wrong projection type can look right, such as the triplanar on the cube which simply projects smaller checkers, but has the right geometry. I also realised that it is not just the concentric projection that appears to be across the whole screen, as the white half of the cylinder is larger than the black half. This projection can be moved using the wire frame place3dtexture objects that appear.

I haven't come across any difficulties with using projection maps so far, but I can see how they can be very useful for future models. The fact that they come in pre-made projection types is very helpful, but they can also be used for landscapes and endless levels, amongst other things as well, as they cover wherever the camera can see where there is an object.

Next, I tried applying the moth image to a sphere. First, I used the cubic projection type, and this projected 6 moths onto the sphere, one from each side, as if it were a cube. What would be the edges of the cube are visibly bent around the sphere.
When I changed the projection type to spherical there was only one moth wrapped around the whole sphere, like in the actual image. The cylindrical projection type left two moths around the sphere, and half a moth on each side from the middle on both faces of (what should be) the cylinder. Finally, I used the planar projection type on a cube primitive, and the moth image was projected on two opposite faces of the cube, as if the image were being fired straight through it.

Generally speaking, I learned a lot of new ways to texture objects from using projection maps, and I did not encounter any difficulties in the process, so I will be eager to use them on my models if appropriate.

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