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We need a system/script that can run on server-side and take input (for example HTML $_POST-data) and dynamically create/build a 3D-model file (wireframe-model) based on these data. The model will always be a building with 4 walls, and input-data tells which kind of roof the building have (4 different types), the height, length and width of building, and where to show doors and windows.
Output-format should be either collada, citygml or 3DS.
For the skilled 3D-programmer this should be easy task.