When Trainz first came out we had very little data on how to make things and the error checking was set to skip lines it did not know in the config file and stop checking on an error. This lied to a lot of errors in old content and why the DLS is being cleaned up.
RULE 1
Don't make what you can't see.
You would thing this was obvious but I have seen it done by new people. This also goes for detail you can not see with the 4 Trainz cameras. I found this out when making a trackside sign that all the detail I had in it could not be seen in game going 1mph and looking for it.
RULE 2
Use as few materials as you can.This is from N3V, and it is materials not textures, a material can have more than one texture, this is why you can have a normal map texture, it dose not count. On the Forums you will see the word "textures" used where the word "materials" should be.
RULE 3
Also from N3V, keep the number of vertexes to a minimum.
This is also known as "number of polys" witch is the wrong thing but what you see in the Forums, it is short for polygons but all video cards only use triangles and only the number of vertexes or points is what you have to watch as there is a lemit on the number you can have( it's in the millions).
This is also why I have RULE 1.
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