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Pyrogenesis HEAD
Pyrogenesis, a RTS Engine
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Pyrogenesis HEAD
Pyrogenesis, a RTS Engine
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| constexpr int | PUSHING_GRID_SIZE = 20 |
| Units push within their square and neighboring squares (except diagonals). More... | |
| constexpr entity_pos_t | PUSHING_CORRECTION = entity_pos_t::FromFraction(5, 7) |
| For pushing, treat the clearances as a circle - they're defined as squares, so we'll take the circumscribing square (approximately). More... | |
| constexpr int | PUSHING_REDUCTION_FACTOR = 2 |
| Arbitrary constant used to reduce pushing to levels that won't break physics for our turn length. More... | |
| constexpr entity_pos_t | MAX_DISTANCE_FACTOR = entity_pos_t::FromFraction(5, 2) |
| Maximum distance-related multiplier. More... | |
| constexpr int | MAX_PUSHING_MULTIPLIER = 4 |
| Maximum pushing multiplier for a single push calculation. More... | |
| constexpr entity_pos_t | PERPENDICULAR_NUDGE_THRESHOLD = entity_pos_t::FromFraction(-1, 10) |
| When two units collide, if their movement dot product is below this value, give them a perpendicular nudge instead of trying to push in the regular way. More... | |
| constexpr int | MAX_PUSH_DAMPING_PRESSURE = 160 |
| Pushing is dampened by pushing pressure, but this is capped so that units still get pushed. More... | |
| constexpr int | MIN_PRESSURE_IF_OBSTRUCTED = 80 |
| When units are obstructed because they're being pushed away from where they want to go, raise the pushing pressure to at least this value. More... | |
| constexpr entity_pos_t | PRESSURE_STATIC_FACTOR = entity_pos_t::FromInt(2) |
| These two numbers are used to calculate pushing pressure between two units. More... | |
| constexpr int | PRESSURE_DISTANCE_FACTOR = 5 |
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constexpr |
Maximum distance-related multiplier.
NB: this value interacts with the "minimal pushing" force, as two perfectly overlapping units exert MAX_DISTANCE_FACTOR * Turn length in ms / REDUCTION_FACTOR of force on each other each turn. If this is below the minimal pushing force, any 2 units can entirely overlap.
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constexpr |
Pushing is dampened by pushing pressure, but this is capped so that units still get pushed.
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constexpr |
Maximum pushing multiplier for a single push calculation.
This exists for numerical stability of the system between a lightweight and a heavy unit.
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constexpr |
When units are obstructed because they're being pushed away from where they want to go, raise the pushing pressure to at least this value.
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constexpr |
When two units collide, if their movement dot product is below this value, give them a perpendicular nudge instead of trying to push in the regular way.
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constexpr |
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constexpr |
These two numbers are used to calculate pushing pressure between two units.
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constexpr |
For pushing, treat the clearances as a circle - they're defined as squares, so we'll take the circumscribing square (approximately).
Clerances are also full-width instead of half, so we want to divide by two. sqrt(2)/2 is about 0.71 < 5/7.
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constexpr |
Units push within their square and neighboring squares (except diagonals).
This is the size of each square (in meters). I have tested grid sizes from 10 up to 80 and overall it made little difference to the performance, mostly, I suspect, because pushing is generally dwarfed by regular motion costs. However, the algorithm remains n^2 in comparisons so it's probably best to err on the side of smaller grids, which will have lower spikes. The balancing act is between comparisons, unordered_set insertions and unordered_set iterations. For these reasons, a value of 20 which is rather small but not overly so was chosen.
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constexpr |
Arbitrary constant used to reduce pushing to levels that won't break physics for our turn length.
1.9.4