Aparna Sakshi   •   over 3 years ago

How to get value of scalar signal in past few frames, or get a delayed version of scalar signal.

I tried using methods like history and delayBy but couldn't succeed. May be the way I was using is not correct. A code sample would do. Thanks in advance.

• 3 comments
• 

  Stef Maccarone Manager   •   over 3 years ago

  Good question - I'm going to ask the experts and get back to you! If anyone else knows the answer in the meantime, feel free to respond!

  Thanks,
  Stefanie

• 

  Alice Pang   •   over 3 years ago

  ISignal.history(number) is the correct way to reference signal values from the past frames. What issues are you running into using the history method?

  signal = signal.history(1)

• 

  Aparna Sakshi   •   over 3 years ago

  //S is for shaders module
  const uv = S.vertexAttribute({"variableName":S.VertexAttribute.TEX_COORDS});
  var color = S.textureSampler(cameraTex.signal, uv);
  var delayed_color = color.history(1);
  const textureSlot = S.DefaultMaterialTextures.DIFFUSE;
  defaultMat.setTextureSlot(textureSlot, delayed_color);
  Spark AR is crashing. :(
  Above code shows camera texture if color passed instead of delayed_color.

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