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feat(selection): port retail offscreen target indicator

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Erik 2026-07-18 07:41:12 +02:00
parent ea4f52ec51
commit ec1bb19609
9 changed files with 404 additions and 97 deletions
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14
src/AcDream.Core/Selection/ScreenProjection.cs
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@ -3,10 +3,9 @@ using System.Numerics;
namespace AcDream.Core.Selection;
/// <summary>
/// Shared screen-space projection math for the target indicator and the
/// world picker. Both call into <see cref="TryProjectSphereToScreenRect"/>
/// so the click hit-area is guaranteed to match the visible indicator
/// rect — "what you see is what you click".
/// Screen-space selection-sphere projection used by SmartBox's vivid target
/// indicator. World picking separately ports retail's visible GfxObj polygon
/// ray tests; the persistent marker intentionally ignores world occlusion.
///
/// <para>
/// Retail equivalent: <c>SmartBox::GetObjectBoundingBox</c> at
@ -35,8 +34,7 @@ public static class ScreenProjection
/// <param name="depth">Out: camera-space depth (<c>clip.W</c>) of the sphere
/// center — use this for nearest-first sorting when multiple rects overlap.</param>
/// <param name="minSidePixels">Minimum side length of the rect. Distant
/// entities clamp to this so they remain pickable / visible. 12 px
/// matches the indicator's clamp floor.</param>
/// entities may clamp to this for a stable presentation.</param>
/// <returns>
/// <c>true</c> if the sphere is in front of the camera and the rect was
/// produced; <c>false</c> if the center is behind the camera
@ -74,9 +72,7 @@ public static class ScreenProjection
if (screenX + screenRadius < -viewport.X || screenX - screenRadius > 2f * viewport.X) return false;
if (screenY + screenRadius < -viewport.Y || screenY - screenRadius > 2f * viewport.Y) return false;
// Floor at minSidePixels so distant entities still get a visible /
// clickable rect. The picker must apply the same floor as the
// indicator or distant clicks won't match the visible bracket.
// Optional presentation floor for very distant spheres.
if (screenRadius < minSidePixels * 0.5f) screenRadius = minSidePixels * 0.5f;
rectMin = new Vector2(screenX - screenRadius, screenY - screenRadius);