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June 24, 2016 08:16
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| bool GetSightRayHitLocation(FVector& HitLocation) const | |
| { | |
| // Find crosshair position in pixel coordinates | |
| int32 ViewportSizeX, ViewportSizeY; | |
| GetViewportSize(ViewportSizeX, ViewportSizeY); | |
| FVector2D ScreenLocation = FVector2D(ViewportSizeX * CrossHairXLocation, ViewportSizeY * CrossHairYLocation); | |
| // "De-project" the screen position of the crosshair to a world direction | |
| FVector LookDirection, LookStartLocation; | |
| if (DeprojectScreenPositionToWorld(ScreenLocation.X, ScreenLocation.Y, LookStartLocation, LookDirection)) | |
| { | |
| // Line-trace along that look direction, and see what we hit | |
| FHitResult HitResult; | |
| if (GetWorld()->LineTraceSingleByChannel( | |
| HitResult, | |
| LookStartLocation, | |
| (LookStartLocation + LookDirection * LineTraceRange), | |
| ECollisionChannel::ECC_Visibility)) | |
| { | |
| HitLocation = HitResult.Location; | |
| return true; | |
| } | |
| } | |
| return false; | |
| } |
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UE docs: https://docs.unrealengine.com/latest/INT/API/Runtime/Engine/Engine/UWorld/LineTraceSingleByChannel/index.html