Function DrawingManager.TryDrawHasher

bool TryDrawHasher (

DrawingData.Hasher	hasher	Hash of whatever inputs you used to generate the drawing data.
RedrawScope	redrawScope=default	Optional redraw scope for this command builder. See GetRedrawScope.

)

Tries to draw a builder that was rendered during the last frame using the same hash.

// Just a nice looking curve (which uses a lot of complex math)
// See https://en.wikipedia.org/wiki/Butterfly_curve_(transcendental)
static float2 ButterflyCurve (float t) {
t *= 12 * math.PI;
var k = math.exp(math.cos(t)) - 2*math.cos(4*t) - math.pow(math.sin(t/12f), 5);
return new float2(k * math.sin(t), k * math.cos(t));
}

// Make the butterfly "flap its wings" two times per second
var scale = Time.time % 0.5f < 0.25f ? new float2(1, 1) : new float2(0.7f, 1);

// Hash all inputs that you use for drawing something complex
var hasher = new DrawingData.Hasher();
// The only thing making the drawing change, in this case, is the scale
hasher.Add(scale);

// Try to draw a previously cached mesh with this hash
if (!DrawingManager.TryDrawHasher(hasher)) {
// If there's no cached mesh, then draw it from scratch
using (var builder = DrawingManager.GetBuilder(hasher)) {
// Draw a complex curve using 10000 lines
var prev = ButterflyCurve(0);
for (float t = 0; t < 1; t += 0.0001f) {
var next = ButterflyCurve(t);
builder.xy.Line(prev*scale, next*scale, Color.white);
prev = next;
}
}
}