rustcollision-detectiontiledbevy
How to do polygon collisions in Bevy with Tiled editor and Rapier?
I'm very new to game dev and to Rust, so I might be way on the wrong track. I'm using bevy 0.10.1, bevy_ecs_tilemap, bevy_rapier2d, and tiled to make a tilemap with collisions specified in the .tsx file. Some of my tiles use polygons to define the collision objects. I'm able to get the rectangular collisions to work, but the polygon collisions are in the wrong location and sometimes the wrong shape.
if let Some(object_layer) = layer_tile.collision.clone() {
let shapes = object_layer
.object_data()
.iter()
.filter_map(|object_data| {
let pos = Vect::new(object_data.x / 2., -object_data.y / 2.);
let rot = object_data.rotation;
let shape = match &object_data.shape {
tiled::ObjectShape::Rect { width, height } => {
Collider::cuboid(width / 2., height / 2.)
}
tiled::ObjectShape::Ellipse { width, height } => {
Collider::capsule_x(width / 2., height / 2.)
}
tiled::ObjectShape::Polyline { points } => {
Collider::polyline(
points
.iter()
.map(|(x, y)| Vect::new(*x, *y))
.collect(),
None,
)
}
tiled::ObjectShape::Polygon { points } => {
Collider::convex_hull(
&points
.iter()
.map(|(x, y)| Vect::new(*x, *y))
.collect::<Vec<_>>(),
)?
}
_ => {
return None;
}
};
Some((pos, rot, shape))
})
.collect::<Vec<_>>();
let world_pos = tile_pos.center_in_world(&grid_size, &map_type);
let transform =
get_tilemap_center_transform(&map_size, &grid_size, &map_type, 0.)
* Transform::from_xyz(
world_pos.x + offset_x,
world_pos.y - offset_y,
0.,
);
if shapes.len() == 1 {
let (pos, rot, collider) = shapes[0].clone();
let transform = transform
* Transform {
translation: Vec3::new(pos.x, pos.y, 0.),
rotation: Quat::from_rotation_x(rot),
..default()
};
commands
.entity(tile_entity)
.insert((collider, TransformBundle::from_transform(transform)));
} else if shapes.len() > 1 {
commands.entity(tile_entity).insert((
Collider::compound(shapes),
TransformBundle::from_transform(transform),
));
}
}
How do I convert tiled polygon collision data into Rapier colliders? Or am I combining tools that don't belong together?
Solution
After much trial and error, I figured out how to do it. The polygons were upside-down and I needed to treat the rectangles different from the polygons. (My tilemap currently doesn't have ellipses or polylines, so I'm assuming they work the same as the other shapes.)
if let Some(object_layer) = layer_tile.collision.clone() {
let shapes = object_layer
.object_data()
.iter()
.filter_map(|object_data| {
let pos = Vect::new(object_data.x, -object_data.y);
let rot = object_data.rotation;
match &object_data.shape {
tiled::ObjectShape::Rect { width, height } => {
let shape = Collider::cuboid(width / 2., height / 2.);
Some((
pos + Vec2::new(
(-grid_size.x + width) / 2.,
(grid_size.y - height) / 2.,
),
rot,
shape,
))
}
tiled::ObjectShape::Ellipse { width, height } => {
let shape =
Collider::capsule_x(width / 2., height / 2.);
Some((
pos + Vec2::new(
(-grid_size.x + width) / 2.,
(grid_size.y - height) / 2.,
),
rot,
shape,
))
}
tiled::ObjectShape::Polyline { points } => {
let shape = Collider::polyline(
points
.iter()
.map(|(x, y)| Vect::new(*x, -*y))
.collect(),
None,
);
Some((
pos + Vec2::new(
-grid_size.x / 2.,
grid_size.y / 2.,
),
rot,
shape,
))
}
tiled::ObjectShape::Polygon { points } => {
let shape = Collider::convex_hull(
&points
.iter()
.map(|(x, y)| Vect::new(*x, -*y))
.collect::<Vec<_>>(),
)?;
Some((
pos + Vec2::new(
-grid_size.x / 2.,
grid_size.y / 2.,
),
rot,
shape,
))
}
_ => {
return None;
}
}
})
.collect::<Vec<_>>();
let world_pos = tile_pos.center_in_world(&grid_size, &map_type);
let transform =
get_tilemap_center_transform(&map_size, &grid_size, &map_type, 0.)
* Transform::from_xyz(
world_pos.x + offset_x,
world_pos.y - offset_y,
0.,
);
if shapes.len() == 1 {
let (pos, rot, collider) = shapes[0].clone();
let transform = transform
* Transform {
translation: Vec3::new(pos.x, pos.y, 0.),
rotation: Quat::from_rotation_x(rot),
..default()
};
commands
.entity(tile_entity)
.insert((collider, TransformBundle::from_transform(transform)));
} else if shapes.len() > 1 {
commands.entity(tile_entity).insert((
Collider::compound(shapes),
TransformBundle::from_transform(transform),
));
}
}
- Rcpp Rf_warningcall compiler warnings
- Modify the name of factor variables in lm function(summary function)
- Extreme value analysis and quantile estimation using log Pearson type 3 (Pearson III) distribution - R vs Python
- How to hide NAs when using xlsx::saveWorkbook?
- How do I retrieve a simple numeric value from a named numeric vector in R?
- Matching pair-wise columns from left to right across rows in one dataframe to another dataframe and adding new columns with matching values
- Income to outcome flow chart in Sankey plotly R
- color mapping in geom_conn_bundle not showing correctly
- Print R package startup message AFTER automatic package conflict messages instead of before
- Summing a set of R dataframe rows (column-wise), while retaining the first n columns
- Added variable / partial regression plots for groups in an interaction?
- how to make a topoplot in R with coordinates variable distribution
- List of all functions in base R?
- Plotting multiple plots for different initial conditions in one graph
- Printing repetitively on the same line in R
- Generating UI/Server based on initial selection
- Subset dataframe based on pickerInput
- How to let user pick the data in R-shiny?
- Couldn't show my simple bar charts separately on Shiny R dashboardBody
- How to programmatically filter contents of a second shiny app displayed via iframe
- How to select specific interesting groups for the boxplot in R Shiny app?
- Crosstable and Plot grouping with reactive values
- Is there a way to make multiple Shiny picker inputs where the selections must be disjoint?
- Delay/avoid duplication of shiny server side functions until after credentials
- Predictions only returns value "1"
- How to display a busy indicator in a shiny app?
- Append doesn't work when writing to CSV in R
- Changing the start date of a gantt chart in DiagrammeR
- Check for installed packages before running install.packages()
- Compare two columns element-wise