#Screen Space UI Box around World Space Collider

1 messages · Page 1 of 1 (latest)

spiral plume
#

Hey all. I'm making a UI element that adjusts to the size of a collider world space as an indicator for aim assist. To do this, I'm getting all the points on the collider bounds, converting them to screen space, and making a screen space box around the points that are furthest from the center of the collider. This calculation works, however it appears to have some issues with the perspective camera when rotating and when changing screen resolution (see attatched video). How can I account for this in my calculation?

        Vector3[] points = new Vector3[8];

        // get all points on collider bounds
        points[0] = new Vector3(testTarget.bounds.min.x, testTarget.bounds.min.y, testTarget.bounds.min.z); // bottom left close
        points[1] = new Vector3(testTarget.bounds.min.x, testTarget.bounds.min.y, testTarget.bounds.max.z); // bottom left far

        points[2] = new Vector3(testTarget.bounds.min.x, testTarget.bounds.max.y, testTarget.bounds.min.z); // top left close
        points[3] = new Vector3(testTarget.bounds.min.x, testTarget.bounds.max.y, testTarget.bounds.max.z); // top left far

        points[4] = new Vector3(testTarget.bounds.max.x, testTarget.bounds.min.y, testTarget.bounds.min.z); // bottom right close
        points[5] = new Vector3(testTarget.bounds.max.x, testTarget.bounds.min.y, testTarget.bounds.max.z); // bottom right far

        points[6] = new Vector3(testTarget.bounds.max.x, testTarget.bounds.max.y, testTarget.bounds.min.z); // top right close
        points[7] = new Vector3(testTarget.bounds.max.x, testTarget.bounds.max.y, testTarget.bounds.max.z); // top right far

        Vector3 screenSpaceBottomCorner = new Vector3(Mathf.Infinity, Mathf.Infinity);
        Vector3 screenSpaceTopCorner = new Vector3(-Mathf.Infinity, -Mathf.Infinity);
        Vector3 screenSpaceCenter = Camera.main.WorldToScreenPoint(testTarget.bounds.center);

        for (int i = 0; i < points.Length; i++)
        {
            Vector3 screenSpacePoint = Camera.main.WorldToScreenPoint(points[i]);

            if (screenSpacePoint.x < screenSpaceBottomCorner.x) screenSpaceBottomCorner.x = screenSpacePoint.x;
            if (screenSpacePoint.y < screenSpaceBottomCorner.y) screenSpaceBottomCorner.y = screenSpacePoint.y;

            if (screenSpacePoint.x > screenSpaceTopCorner.x) screenSpaceTopCorner.x = screenSpacePoint.x;
            if (screenSpacePoint.y > screenSpaceTopCorner.y) screenSpaceTopCorner.y = screenSpacePoint.y;
        }

        _aimAssistCrosshair.sizeDelta = new Vector2(
            Mathf.Abs(screenSpaceTopCorner.x - screenSpaceBottomCorner.x),
            Mathf.Abs(screenSpaceTopCorner.y - screenSpaceBottomCorner.y));

        _aimAssistCrosshair.position = screenSpaceCenter;```
proud sleet
#

I presume in situations like this due to perspective its enlarging the bounds too much. I cant think of a solution that isnt performing similar logic for all mesh verts (excluding those outside view)

image.png
twin hound
spiral plume
#

Why doesn't WorldToScreenPoint account for the camera's perspective? is there another function I could use to get the points?

sharp lantern
spiral plume
sharp lantern