-
- // Find the closest spoke's t-value and calculate its
- // axis. Until everything animates in the model reference
- // frame, this has to be calculated at every step because
- // the helices rotate.
- float t = h1.getAxis().getTValue(pt) + spokePhase;
- float spokeAxisTValue = floor(((t + spokePeriod/2) / spokePeriod)) * spokePeriod;
- PVector h1point = h1.pointOnToroidalAxis(spokeAxisTValue);
- PVector h2point = h2.pointOnToroidalAxis(spokeAxisTValue);
- PVector spokeVector = PVector.sub(h2point, h1point);
- spokeVector.normalize();
- Line spokeLine = new Line(h1point, spokeVector);
- float spokeLength = PVector.dist(h1point, h2point);
- // TODO(shaheen) investigate why h1.getAxis().getPointAt(spokeAxisTValue) doesn't quite
- // have the same value.
- PVector spokeCenter = PVector.add(h1point, PVector.mult(spokeVector, spokeLength/2.f));
- PVector spokeStart = PVector.add(spokeCenter, PVector.mult(spokeLine.getVector(), -spokeRadius));
- PVector spokeEnd = PVector.add(spokeCenter, PVector.mult(spokeLine.getVector(), spokeRadius));
- float spokeStartTValue = spokeLine.getTValue(spokeStart);
- float spokeEndTValue = spokeLine.getTValue(spokeEnd);
- PVector pointOnSpoke = spokeLine.projectPoint(pt);
- float projectedTValue = spokeLine.getTValue(pointOnSpoke);
- float percentage = constrain(PVector.dist(pointOnSpoke, spokeStart) / spokeLength, 0.f, 1.f);
- float b = ((PVector.dist(pt, pointOnSpoke) < spokeGirth) && (PVector.dist(pointOnSpoke, spokeCenter) < spokeRadius)) ? 100.f : 0.f;
-
- color spokeColor;
-
- if (spokeStartTValue < spokeEndTValue) {
- spokeColor = lerpColor(h1c, h2c, percentage);
- } else {
- spokeColor = lerpColor(h2c, h1c, percentage);
- }
-
- spokeColor = color(hue(spokeColor), 80.f, b);