As soon as a mesh has one or more symmetry lines, the pivot should be on this line or in the point of intersection. The next step is checking your mesh for symmetry lines. While some models already have a good pivot, for most models, you have to refine the pivot position to get an easy-to-use model. The first step is to place the pivot in the focal point of the model. There are 5 steps for pivot placement that can be used with every model, and will result in a perfect pivot position: Pivot placement: the aim here is to place the pivot in the most useful position for the level designer, so he can place the model quickly and easily in the 3D space. Make sure the measurements of the models that will be used together match (if your wall segments are 256 wide, then also make your floor/ceiling segments 256 wide).

You can repeat this process untill you find a power of two that fits, but just don't overdo it. If it still doesn't fit, you can add or subtract the next smaller power of 2. You can now fit your model to a width of 384 units. For example, if the proportions of your wall segment doesn't fit into a span of 256 units, which is 2 to the power of 8, then you can add 128 units which is 2 to the power of 7. If, when modeling for some real-life environments, your model doesn't fit into a power of 2 measurement, it's best to just add or subtract to the next power of two. So the perfect solution here would be to make the wall segment 256 wide and 256 high. The best matching value here would be 256 units, which is 2 to the power of 8. This means when you model a wall segment, don't make it 248 units wide and 240 units high. To make it exact use the “grid snap” function in your 3D package. To make the model as easy to use as possible, always align it with the grid lines. Before you start modelling, be sure that your grid for the 3D package you use is exactly the same as the grid of the engine you make the model for. The idea of modular models for 3D environments is to create fast environments with small tiling models and maximum flexibility. Well, you already know that i am a 3D Coater, so if you have any questions, don't hesitate to ask, and i'll answer them as good as i can.

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