thumb pad roll

app/Mono.cs

@@ -96,6 +96,26 @@ public class Mono {
     dofs[3].Frame();
 
 
+    // turn this into a function
+    Vec3 vA = new Vec3(-1, 0, 0);
+    Vec3 vB = new Vec3(1, 1, 1);
+
+    Vec3 vC = Input.Hand(Handed.Right).palm.position;
+
+    Quat q = Quat.LookDir((vB - vA).Normalized);
+
+    // // snap vC to line vA-vB
+    // Vec3 local = q.Inverse * (vC - vA);
+    // local.x = 0;
+    // local.y = 0;
+    // vC = q * local + vA;
+
+		vC = vC.SnapToLine(vA, vB, true);
+
+    Lines.Add(vA, vB, new Color(1, 1, 1), 0.002f);
+    Mesh.Cube.Draw(matDev, Matrix.TRS(vC, q, 0.04f));
+
+
     // rGlove.Step(); lGlove.Step();
 
     // rBlock.Step(); lBlock.Step();

app/PullRequest.cs

@@ -92,8 +92,43 @@ public static class PullRequest {
 		return (to - from).Normalized;
 	}
 
-	// swizzle
+	public static Vec3 SnapToLine(this Vec3 v, Vec3 a, Vec3 b, bool clamp) {
-	public static Vec3 JustX(this Vec3 v) {
+    Quat q = Quat.LookDir(Direction(b, a));
+    Vec3 lv = q.Inverse * (v - a);
+    lv.x = lv.y = 0;
+		Vec3 r = q * lv + a;
+		if (clamp) {
+			float d = (b - a).Length;
+			float t = (r - a).Length / d;
+			if (t < 0) t = 0;
+			if (t > 1) t = 1;
+			r = a + (b - a) * t;
+		}
+    return r;
+  }
+
+  /*
+	// turn this into a function
+		Vec3 vA = new Vec3(-1, 0, 0);
+		Vec3 vB = new Vec3(1, 1, 1);
+
+		Vec3 vC = Input.Hand(Handed.Right).palm.position;
+
+		Quat q = Quat.LookDir((vB - vA).Normalized);
+
+		// snap vC to line vA-vB
+		Vec3 local = q.Inverse * (vC - vA);
+		local.x = 0;
+		local.y = 0;
+		vC = q * local + vA;
+
+		Lines.Add(vA, vB, new Color(1, 1, 1), 0.002f);
+		Mesh.Cube.Draw(matDev, Matrix.TRS(vC, q, 0.04f));
+
+	*/
+
+  // swizzle
+  public static Vec3 JustX(this Vec3 v) {
 		return new Vec3(v.x, 0, 0);
 	}
 	public static Vec3 JustY(this Vec3 v) {

app/dofs/trackballer/Trackballer.cs

@@ -18,10 +18,10 @@ class Trackballer : dof {
 			Matrix mAnchor = Matrix.TR(anchor, hand.palm.orientation);
 			Matrix mAnchorInv = mAnchor.Inverse;
 
-			Vec3 pad = Vec3.Lerp(
+			Vec3 pad = anchor.SnapToLine(
-				hand.Get(FingerId.Thumb, JointId.KnuckleMinor).position,
 				hand.Get(FingerId.Thumb, JointId.Tip).position,
-				0.5f
+				hand.Get(FingerId.Thumb, JointId.KnuckleMinor).position,
+				true
 			);
 			Vec3 localPad = mAnchorInv.Transform(pad);
 
@@ -31,25 +31,32 @@ class Trackballer : dof {
 			} else {
       	btnIn.Step(localPad.Length < layer[0]);
 			}
-			color = btnIn.held ? new Color(1, 0, 0) : Color.White;
+			color = btnIn.held ? new Color(1, 0, 0) : color;
 
-			
+      if (btnOut.held) {
-      btnOut.Step(localPad.Length > layer[2]);
+        btnOut.Step(localPad.Length > layer[1]);
-			if (localPad.Length > layer[2]) {
+      } else {
-				color = new Color(0, 1, 1);
+				btnOut.Step(localPad.Length > layer[2]);
 			}
+			color = btnOut.held ? new Color(0, 1, 0) : color;
 
-			if (localPad.Length < layer[1]) {
+			if (btnIn.held) {
-				delta = PullRequest.Relative(
+				delta = Quat.Identity;
-					hand.palm.orientation,
+			} else {
-					PullRequest.Delta(localPad.Normalized, oldLocalPad.Normalized)
+				if (localPad.Length < layer[1]) {
-				).Normalized;
+					delta = PullRequest.Relative(
+						hand.palm.orientation,
+						PullRequest.Delta(localPad.Normalized, oldLocalPad.Normalized)
+					).Normalized;
+				}
 			}
 
     	oldLocalPad = localPad;
 
 			// Draw
-			Mesh.Sphere.Draw(Mono.inst.matDev, Matrix.TRS(anchor, ori, 0.045f), color);
+			Mesh.Cube.Draw(Mono.inst.matDev, Matrix.TRS(anchor, ori, 0.04f), color);
+
+			Mesh.Sphere.Draw(Mono.inst.matDev, Matrix.TRS(pad, hand.palm.orientation, 0.015f), new Color(0, 1, 0));
     }
 
 		Quat newOri = delta * ori;
@@ -66,7 +73,7 @@ class Trackballer : dof {
 
 	// design
   public Handed handed = Handed.Left;
-  public float[] layer = new float[] { 0.015f, 0.03f, 0.055f };
+  public float[] layer = new float[] { 0.00333f, 0.02f, 0.0666f };