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Set GRAVITY to 25.0 as in master and adjust drag reference area scale to compensate

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This commit is contained in:
Ludvig Böklin 2021-06-07 12:26:18 +02:00
parent ddcc86ee08
commit 27c4afbf1b
2 changed files with 18 additions and 14 deletions
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30
common/src/comp/body.rs
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@ -762,15 +762,19 @@ impl Drag for Body {
///
/// This coefficient includes the reference area.
fn parasite_drag_coefficient(&self) -> f32 {
// Scale modifier to reduce or increase drag as needed to give bodies reasonable
// terminal velocities for the gravitational acceleration of this world
// const SCALE_MODIFIER: f32 = 0.6; // if we can eventually have 1G
const SCALE_MODIFIER: f32 = 1.1; // for 2.5G
// Reference area and drag coefficient assumes best-case scenario of the
// orientation producing least amount of drag
match self {
// Cross-section, head/feet first
Body::BipedLarge(_) | Body::BipedSmall(_) | Body::Golem(_) | Body::Humanoid(_) => {
// const SCALE: f32 = 0.7;
let radius = self.dimensions().xy().map(|a| inline_tweak::tweak!(0.6) * a * 0.5);
let radii = self.dimensions().xy().map(|a| SCALE_MODIFIER * a * 0.5);
const CD: f32 = 0.7;
CD * PI * radius.x * radius.y
CD * PI * radii.x * radii.y
},
// Cross-section, nose/tail first
@ -778,13 +782,13 @@ impl Drag for Body {
| Body::QuadrupedMedium(_)
| Body::QuadrupedSmall(_)
| Body::QuadrupedLow(_) => {
let radius = self.dimensions().map(|a| a * 0.5);
let radii = self.dimensions().map(|a| SCALE_MODIFIER * a * 0.5);
let cd: f32 = if matches!(self, Body::QuadrupedLow(_)) {
0.7
} else {
1.0
};
cd * PI * radius.x * radius.z
cd * PI * radii.x * radii.z
},
Body::BirdMedium(bird) => bird.parasite_drag_coefficient(),
@ -793,11 +797,11 @@ impl Drag for Body {
// Cross-section, zero-lift angle; exclude the fins
Body::FishMedium(_) | Body::FishSmall(_) => {
let radius = self.dimensions().map(|a| a * 0.5);
let radii = self.dimensions().map(|a| SCALE_MODIFIER * a * 0.5);
// "A Simple Method to Determine Drag Coefficients in Aquatic Animals",
// D. Bilo and W. Nachtigall, 1980
const CD: f32 = 0.031;
CD * PI * radius.x * radius.z
CD * PI * radii.x * radii.z
},
Body::Object(object) => match object {
@ -812,9 +816,9 @@ impl Drag for Body {
| object::Body::FireworkWhite
| object::Body::FireworkYellow
| object::Body::MultiArrow => {
let radius = self.dimensions().map(|a| a * 0.5);
let radii = self.dimensions().map(|a| SCALE_MODIFIER * a * 0.5);
const CD: f32 = 0.02;
CD * PI * radius.x * radius.z
CD * PI * radii.x * radii.z
},
// spherical-ish objects
@ -831,13 +835,13 @@ impl Drag for Body {
| object::Body::Pumpkin3
| object::Body::Pumpkin4
| object::Body::Pumpkin5 => {
let radius = self.dimensions().xy().map(|a| a * 0.5);
let radii = self.dimensions().xy().map(|a| SCALE_MODIFIER * a * 0.5);
const CD: f32 = 0.5;
CD * PI * radius.product()
CD * PI * radii.product()
},
_ => {
let dim = self.dimensions();
let dim = self.dimensions().map(|a| SCALE_MODIFIER * a);
const CD: f32 = 2.0;
CD * (PI / 6.0 * dim.x * dim.y * dim.z).powf(2.0 / 3.0)
},
@ -846,7 +850,7 @@ impl Drag for Body {
Body::Ship(_) => {
// Airships tend to use the square of the cube root of its volume for
// reference area
let dim = self.dimensions();
let dim = self.dimensions().map(|a| SCALE_MODIFIER * a);
(PI / 6.0 * dim.x * dim.y * dim.z).powf(2.0 / 3.0)
},
}

2
common/src/consts.rs
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@ -2,7 +2,7 @@
pub const MAX_PICKUP_RANGE: f32 = 8.0;
pub const MAX_MOUNT_RANGE: f32 = 14.0;
pub const GRAVITY: f32 = 9.81;
pub const GRAVITY: f32 = 25.0;
pub const FRIC_GROUND: f32 = 0.15;
// Values for air taken from http://www-mdp.eng.cam.ac.uk/web/library/enginfo/aerothermal_dvd_only/aero/atmos/atmos.html