Vanilla sprite train

This example demonstrates how to achieve sprite trains in vanilla Half-Life. That's right, folks, no SoHL needed!

How to make

1. Place an env_sprite, with the "Start on" and "Only once" flags enabled
2. Place a func_train, with the "Not solid" flag enabled
3. Give the env_sprite a unique name (e.g. bobby)
4. Add a zhlt_usemodel keyvalue to the train, and in the value field, type in the sprite's entity name (e.g. bobby)

Notes

• The func_train MUST have the "Not solid" flag checked, or else the engine will crash when the train is inside your FOV
• If you want to control properties like render mode, render amount etc., do it on the func_train
• An env_sprite is absolutely required in the map, so the game can precache the sprite model. Without precaching it, it won't work and the game will crash
• This can also be used for studio models (.mdl files)
• Animated sprites won't work
• Triggering the train won't turn off the sprite (this is a func_train after all), use env_render for that
• Untested, but avelocity should work
• Untested, but special sprite orientations (VP_ORIENTED etc.) should also work