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Add the possibility to create custom 2d orthographic cameras (#4048)

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# Objective

- The `OrthographicCameraBundle` constructor for 2d cameras uses a hardcoded value for Z position and scale of the camera. It could be useful to be able to customize these values.

## Solution

- Add a new constructor `custom_2d` that takes `far` (Z position) and `scale` as parameters. The default constructor `new_2d` uses this constructor with `far = 1000.0` and `scale = 1.0`.
This commit is contained in:
nsarlin 2022-04-25 13:54:44 +00:00
parent ec30822517
commit 0850975192
1 changed files with 10 additions and 1 deletions
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11
crates/bevy_render/src/camera/bundle.rs
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@ -133,9 +133,18 @@ impl OrthographicCameraBundle<Camera2d> {
/// corresponding to `Z=+999.9` (closest to camera) to `Z=-0.1` (furthest away from
/// camera) in world space.
pub fn new_2d() -> Self {
Self::new_2d_with_far(1000.0)
}
/// Create an orthographic projection camera with a custom Z position.
///
/// The camera is placed at `Z=far-0.1`, looking toward the world origin `(0,0,0)`.
/// Its orthographic projection extends from `0.0` to `-far` in camera view space,
/// corresponding to `Z=far-0.1` (closest to camera) to `Z=-0.1` (furthest away from
/// camera) in world space.
pub fn new_2d_with_far(far: f32) -> Self {
// we want 0 to be "closest" and +far to be "farthest" in 2d, so we offset
// the camera's translation by far and use a right handed coordinate system
let far = 1000.0;
let orthographic_projection = OrthographicProjection {
far,
depth_calculation: DepthCalculation::ZDifference,