draw.CameraTargets silently fails

ALINE
1

Regarding camera assignment and the code example referenced here:
ALINE Documentation – Advanced Cameras

The example provided in the documentation allocates a new array every frame within Update. To optimize this, I switched to using a preallocated array (_CameraTargets) and simply update its first element each frame, like so:

_CameraTargets[0] = InputManager.Instance.CurrentCamera;

However, this change causes the assignment to draw.cameraTargets to silently fail. After the line:

draw.cameraTargets = _CameraTargets;

draw.cameraTargets remains null.

Here’s the full snippet for context:

_CameraTargets[0] = InputManager.Instance.CurrentCamera;

var draw = DrawingManager.GetBuilder(true);
draw.cameraTargets = _CameraTargets;
using (draw.WithMatrix(matrix))
using (draw.WithLineWidth(LineWidth, IsAutomaticJoinsEnabled))
{
    if (IsSolidEnabled)
        draw.SolidBox(LocalPosition, Quaternion.identity, 1.0f, FillColor);
    draw.WireBox(LocalPosition, Quaternion.identity, 1.0f, LineColor);
}
draw.Dispose();

Is there an internal check that prevents the cameraTargets assignment if the array is reused or modified externally? Or is there a required step to force the DrawingManager to recognize updated values in a persistent array?

2

Hi

I cannot see anything in the code that would cause that kind of issue.

Can you verify this? I see no way for this to happen. Verify that you are really setting something non-null to the property, and it then returns null.

3

The array must stay consistent until the end of the frame, though. No copy of it is made directly, and it is first checked when the cameras are rendered.

4

Hi Aron,

I’m retesting this morning and I can’t reproduce it. I’m using the same code shared above. I’m wondering if it is a bug in the editor showing the outline as a gizmo (when gizmos were turned off). I’ll keep watching this.

I have debugging logic in place to provide more information if it happens again.

_CameraTargets[0] = InputManager.Instance.CurrentCamera;

if (_CameraTargets[0] == null)
    Debug.LogError("source camera is null");

var draw = DrawingManager.GetBuilder(true);
draw.cameraTargets = _CameraTargets;

if (draw.cameraTargets == null || draw.cameraTargets[0] == null)
    Debug.LogError("destination camera is null");

using (draw.WithMatrix(matrix))
using (draw.WithLineWidth(LineWidth, IsAutomaticJoinsEnabled))
{
    if (IsSolidEnabled)
        draw.SolidBox(LocalPosition, Quaternion.identity, 1.0f, FillColor);
    draw.WireBox(LocalPosition, Quaternion.identity, 1.0f, LineColor);
}

draw.Dispose();
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