Difference between revisions of "Callback: Build probability"
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| − | == Probability |
+ | == Build Probability (162) == |
| + | This callback allows the game to ask for the chances of an action happening on build. (Currently the only action is reversing rail vehicles.) |
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| − | This callback assigns rail vehicles a random chance of being built facing forward or backward (reversed) when purchased. |
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| − | Return a value between 0...100 (decimal) to indicate the probability of |
+ | Return a value between 0...100 (decimal) to indicate the probability of an action happening. |
| + | Returning 0 means the action will never happen. |
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| ⚫ | |||
| + | Returning 50 means the action will have a 50:50 chance of happening. |
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| + | Returning 100 means the action will always happen. |
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| + | |||
| + | {| |- |
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| + | !Variable 10!!Meaning |
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| + | |- |
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| + | |0||Probability of reversing rail vehicle, i.e. facing forward or backward, when purchased*. |
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| + | |- |
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| + | |..||Reserved. |
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| + | |} |
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| + | |||
| ⚫ | |||
This callback is available from {{ottdp|14|no|ottdrev=g05ed9f56fd}} OpenTTD 14 and above. |
This callback is available from {{ottdp|14|no|ottdrev=g05ed9f56fd}} OpenTTD 14 and above. |
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Latest revision as of 20:54, 30 November 2023
Build Probability (162)
This callback allows the game to ask for the chances of an action happening on build. (Currently the only action is reversing rail vehicles.)
Return a value between 0...100 (decimal) to indicate the probability of an action happening.
Returning 0 means the action will never happen. Returning 50 means the action will have a 50:50 chance of happening. Returning 100 means the action will always happen.
| Variable 10 | Meaning |
|---|---|
| 0 | Probability of reversing rail vehicle, i.e. facing forward or backward, when purchased*. |
| .. | Reserved. |
- The same random-reverse behaviour can be implemented without the callback, by randomly switching to reversed sprites in the vehicle's varaction 2 chain, but this is inefficient as it typically causes sprites to be duplicated in the grf.
This callback is available from 
14 
OpenTTD 14 and above.
