ProjectWorldLocationToScreen

rubm123 · November 10, 2022, 12:38pm

I added some more extensive information on the whole topic here:

rubenmoor/projectzero/blob/main/TrackingIndicator.md

# Recipe: Tracking indicator for quest marks or important objects in the player's world

Imagine there is an important object in the world that you want to highlight for the player.
When the object is not visible on the screen you want to show an arrow at the edge of the screen, pointing in the direction of the objection.
In more technical terms:
If the projection of the objects world location to screen coordinates results in a position outside the viewporty, you display an indicator.

This mechanism makes sense for both, first-person view and third-person view.
The below example assumes a third-person view.

## The indicator

I use the [bindwidget approach](https://benui.ca/unreal/ui-bindwidget/) to access HUD elements in C++.
This means, I create a C++ class, `UW_HUD`, that inherits from `UUserWidget` and has the following member:

```cpp
UPROPERTY(meta=(BindWidget))
TObjectPtr<UCanvasPanel> CanvasIndicator;

UPROPERTY(meta=(BindWidget))

This file has been truncated. show original