Allow optional extraction of resources from the main world #10109
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…e#10109) # Objective From my understanding, although resources are not meant to be created and removed at every frame, they are still meant to be created dynamically during the lifetime of the App. But because the extract_resource API does not allow optional resources from the main world, it's impossible to use resources in the render phase that were not created before the render sub-app itself. ## Solution Because the ECS engine already allows for system parameters to be `Option<Res>`, it just had to be added. --- ## Changelog - Changed - `extract_resource` now takes an optional main world resource - Fixed - `ExtractResourcePlugin` doesn't cause panics anymore if the resource is not already inserted
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…e#10109) # Objective From my understanding, although resources are not meant to be created and removed at every frame, they are still meant to be created dynamically during the lifetime of the App. But because the extract_resource API does not allow optional resources from the main world, it's impossible to use resources in the render phase that were not created before the render sub-app itself. ## Solution Because the ECS engine already allows for system parameters to be `Option<Res>`, it just had to be added. --- ## Changelog - Changed - `extract_resource` now takes an optional main world resource - Fixed - `ExtractResourcePlugin` doesn't cause panics anymore if the resource is not already inserted
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Objective
From my understanding, although resources are not meant to be created and removed at every frame, they are still meant to be created dynamically during the lifetime of the App.
But because the extract_resource API does not allow optional resources from the main world, it's impossible to use resources in the render phase that were not created before the render sub-app itself.
Solution
Because the ECS engine already allows for system parameters to be
Option<Res>, it just had to be added.Changelog
Changed
extract_resourcenow takes an optional main world resourceFixed
ExtractResourcePlugindoesn't cause panics anymore if the resource is not already inserted