I'm trying to build a Shader in "Reality Composer Pro" that updates from a start time. Initially I tried the following:
The idea was that when the startTime was 0, the output would be 0, but then I would set startTime from within code and this would be compared with the current GPU time, and difference used to drive another part of the shader graph:
if
let testEntity = root.findEntity(named: "Test"),
var shaderGraphMaterial = testEntity.components[ModelComponent.self]?.materials.first as? ShaderGraphMaterial
{
let time = CFAbsoluteTimeGetCurrent()
try! shaderGraphMaterial.setParameter(name: "StartTime", value: .float(Float(time)))
testEntity.components[ModelComponent.self]?.materials[0] = shaderGraphMaterial
}
However, I haven't found a reference to the time the shader would be using.
So now I am trying to write an EntityAction to achieve the same effect. Instead of comparing a start time to the GPU's time I'm trying to animate one of the shader's uniform input. However, I'm not sure how to specify the bind target. Here's my attempt so far:
import RealityKit
struct ShaderAction: EntityAction {
let startValue: Float
let targetValue: Float
var animatedValueType: (any AnimatableData.Type)? { Float.self }
static func registerEntityAction() {
ShaderAction.subscribe(to: .updated) { event in
guard let animationState = event.animationState else { return }
let value = simd_mix(event.action.startValue, event.action.targetValue, Float(animationState.normalizedTime))
animationState.storeAnimatedValue(value)
}
}
}
extension Entity {
func updateShader(from startValue: Float, to targetValue: Float, duration: Double) {
let fadeAction = ShaderAction(startValue: startValue, targetValue: targetValue)
if let shaderAnimation = try? AnimationResource.makeActionAnimation(for: fadeAction, duration: duration, bindTarget: .material(0).customValue) {
playAnimation(shaderAnimation)
}
}
}
'''
Currently when I run this I get an assertion failure: 'Index out of range (operator[]:line 797) index = 260, max = 8'
Furthermore, even if it didn't crash I don't understand how to pass a binding to the custom shader value "startValue".
Any clues of how to achieve this effect - even if it's a completely different way.
Topic:
Graphics & Games
SubTopic:
RealityKit
Tags:
RealityKit
Reality Composer Pro
Shader Graph Editor