up3

server/entity/direction.go

@@ -0,0 +1,22 @@
+package entity
+
+import (
+	"github.com/df-mc/dragonfly/server/world"
+	"github.com/go-gl/mathgl/mgl64"
+)
+
+// Eyed represents an entity that has eyes.
+type Eyed interface {
+	// EyeHeight returns the offset from their base position that the eyes of an entity are found at.
+	EyeHeight() float64
+}
+
+// EyePosition returns the position of the eyes of the entity if the entity implements entity.Eyed, or the
+// actual position if it doesn't.
+func EyePosition(e world.Entity) mgl64.Vec3 {
+	pos := e.Position()
+	if eyed, ok := e.(Eyed); ok {
+		pos[1] += eyed.EyeHeight()
+	}
+	return pos
+}