Struct re_space_view_spatial::contexts::transform_context::TransformContext

pub struct TransformContext {
    space_origin: EntityPath,
    transform_per_entity: IntMap<EntityPath, TransformInfo>,
    unreachable_descendants: Vec<(EntityPath, UnreachableTransformReason)>,
    first_unreachable_parent: Option<(EntityPath, UnreachableTransformReason)>,
}

Provides transforms from an entity to a chosen reference space for all elements in the scene for the currently selected time & timeline.

The renderer then uses this reference space as its world space, making world and reference space equivalent for a given space view.

Should be recomputed every frame.

TODO(#7025): Alternative proposal to not have to deal with tree upwards walking & per-origin tree walking.

Fields

space_origin: EntityPath

All transforms provided are relative to this reference path.

transform_per_entity: IntMap<EntityPath, TransformInfo>

All reachable entities.

unreachable_descendants: Vec<(EntityPath, UnreachableTransformReason)>

All unreachable descendant paths of reference_path.

first_unreachable_parent: Option<(EntityPath, UnreachableTransformReason)>

The first parent of reference_path that is no longer reachable.

Implementations

impl TransformContext

fn gather_parent_transforms<'a>( &mut self, ctx: &'a ViewContext<'a>, query: &ViewQuery<'_>, current_tree: &'a EntityTree, time_query: &LatestAtQuery )

Gather transforms for everything above the root.

fn gather_descendants_transforms( &mut self, ctx: &ViewContext<'_>, view_query: &ViewQuery<'_>, subtree: &EntityTree, entity_db: &EntityDb, query: &LatestAtQuery, transform: TransformInfo )

pub fn reference_path(&self) -> &EntityPath

pub fn transform_info_for_entity( &self, ent_path: &EntityPath ) -> Option<&TransformInfo>

Retrieves transform information for a given entity.

Returns None if it’s not reachable from the view’s origin.

Trait Implementations

impl Clone for TransformContext

fn clone(&self) -> TransformContext

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Default for TransformContext

fn default() -> Self

Returns the “default value” for a type.

impl IdentifiedViewSystem for TransformContext

fn identifier() -> ViewSystemIdentifier

Unique name for a system within a given crate::SpaceViewClass.

impl ViewContextSystem for TransformContext

fn execute(&mut self, ctx: &ViewContext<'_>, query: &ViewQuery<'_>)

Determines transforms for all entities relative to a space path which serves as the “reference”. I.e. the resulting transforms are “reference from scene”

This means that the entities in reference_space get the identity transform and all other entities are transformed relative to it.

fn compatible_component_sets(&self) -> Vec<ComponentNameSet>

Returns all the component sets that the system is compatible with.

fn as_any(&self) -> &dyn Any

Converts itself to a reference of std::any::Any, which enables downcasting to concrete types.