[orx-camera] Add option to disable motion damping

orx-camera/src/main/kotlin/Orbital.kt

@@ -20,7 +20,16 @@ class Orbital : Extension {
     var keySpeed = 1.0
     var projectionType = ProjectionType.PERSPECTIVE
 
-    val camera by lazy { OrbitalCamera(eye, lookAt, fov, near, far, projectionType) }
+    /**
+     * Damping factor for camera motion, set to 0 for no damping
+     */
+    var dampingFactor = 0.05
+
+    val camera by lazy {
+        OrbitalCamera(eye, lookAt, fov, near, far, projectionType).apply {
+            dampingFactor = this@Orbital.dampingFactor
+        }
+    }
     val controls by lazy { OrbitalControls(camera, userInteraction, keySpeed) }
 
     override fun setup(program: Program) {

orx-camera/src/main/kotlin/OrbitalCamera.kt

@@ -104,6 +104,11 @@ class OrbitalCamera(eye: Vector3 = Vector3.ZERO, lookAt: Vector3 = Vector3.UNIT_
         dirty = true
     }
 
+    fun scaleTo(s: Double) {
+        magnitudeEnd = s
+        dirty = true
+    }
+
     fun zoom(degrees: Double) {
         fovEnd += degrees
         dirty = true
@@ -118,7 +123,7 @@ class OrbitalCamera(eye: Vector3 = Vector3.ZERO, lookAt: Vector3 = Vector3.UNIT_
         if (!dirty) return
         dirty = false
 
-        val dampingFactor = dampingFactor * timeDelta / 0.0060
+        val dampingFactor = if (dampingFactor > 0.0) { dampingFactor * timeDelta / 0.0060 } else 1.0
         val sphericalDelta = sphericalEnd - spherical
         val lookAtDelta = lookAtEnd - lookAt
         val fovDelta = fovEnd - fov