Checking if element has property
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I meant from the source code, when the particle collides with another, I wanted to check if the particle it collided with has a certain property
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C++
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There isn't an inbuilt function for detecting collisions like that but you can very easily write your own, something along the lines of if (TYP(r)&& parts[ID(r)].vx !=0) to give a better idea.
Then you could detect for a special property like .tmp or whatever you want and store it (see how sensor elements do it).
This again is a very basic explaination and will definitely require adjustments as per your need. Feel free to ask for further help.
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There is a much more correct way to check for particle collisions, which would be to hook into the particle movement logic. Think of elements like VOID, which eats particles that collide with it.
You can find that logic in try_move here, with some additional special cases in eval_move right above it (such as the aforementioned VOID logic).
You can get information on the colliding particle with parts[i], all properties such as life,ctype,tmp reside here. If you want properties of the element type as a whole, you can use elements[parts[i].type]. If you give me more specifics I can tell you what exactly to check for.
