* **:green_circle: Action**: In the UI snippet for `MyLightRandomzier`, set the minimum and maximum for range to 0.5 and 3.
* **:green_circle: Action**: In the UI snippet for `MyLightRandomzier`, set the minimum and maximum for range to **0.5** and **3**.
The `OnIterationStart()` function is used for telling the Randomizer what actions to perform at the start of each Iteration of the Scenario. As seen in the code block, at the start of each Iteration, this class queries the `tagManager` object for all objects that carry the `MyLightRandomizerTag` component. Then, for each object inside the queried list, it first retrieves the `Light` component, and then sets its intensity to a new random float sampled from `lightIntensityParameter`.
The `OnIterationStart()` function is used for telling the Randomizer what actions to perform at the start of each Iteration of the Scenario. As seen in the code block, at the start of each Iteration, this class queries the `tagManager` object for all RandomizerTag components of type `MyLightRandomizerTag` that are currently present on active objects in the Scene. Then, for each tag inside the queried list, it first retrieves the `Light` component of the GameObject the tag is attached to, and then sets the light's intensity to a new random float sampled from `lightIntensityParameter`.
* **:green_circle: Action**: Open `MyLightRandomizerTag.cs` and replace its contents with the code below:
Yes, a RandomizerTag can be this simple if you just need it for helping Randomizers query for target objects. Later, you will learn how to add code here to encapsulate more data and logic within the randomized objects.
Notice there is a `RequireComponent(typeof(Light))` line at the top. This line makes it so that you can only add the `MyLightRandomizerTag` component to an object that already has a `Light` component attached. This way, the Randomizers that query for this tag can be confident that the found objects have a `Light` component and can thus be Randomized.
Notice there is a `RequireComponent(typeof(Light))` line at the top. This line makes it so that you can only add the `MyLightRandomizerTag` component to an object that already has a `Light` component attached. This way, the Randomizers that query for this tag can be confident that the found tags are attached to GameObjects that also have a `Light` component, and can thus be Randomized.
* **:green_circle: Action**: Select `Directional Light` in the Scene's _**Hierarchy**_, and in the _**Inspector**_ tab, add a `My Light Randomizer Tag` component.
* **:green_circle: Action**: Run the simulation again and inspect how `Directional Light` now switches between different intensities. You can pause the simulation and then use the step button (to the right of the pause button) to move the simulation one frame forward and clearly see the varying light intensity
}
```
If you now check the UI snippet for `MyLightRandomizer`, you will notice that `Color Parameter` is added. This Parameter includes four separate randomized values for `Red`, `Green`, `Blue` and `Alpha`. Note that the meaningful range for all of these values is 0-1 (and not 0-255). You can see that the sampling range for red, green, and blue is currently also set to 0-1, which means the Parameter covers a full range of colors. A color with (0,0,0) RGB components essentially emits no light. So, let's increase the minimum a bit to avoid such a scenario.
If you now check the UI snippet for `MyLightRandomizer`, you will notice that `Color Parameter` is added. This Parameter includes four separate randomized values for `Red`, `Green`, `Blue` and `Alpha`. Note that the meaningful range for all of these values is 0-1 (and not 0-255). You can see that the sampling range for red, green, and blue is currently set to 0-1, which means the Parameter covers a full range of colors. A color with (0,0,0) RGB components essentially emits no light. So, let's increase the minimum a bit to avoid such a scenario.
* **:green_circle: Action**: Increase the minimum value for red, green, and blue components to 0.4 (this is an arbitrary number that typically produces good-looking results).
* **:green_circle: Action**: Increase the minimum value for red, green, and blue components to **0.4** (this is an arbitrary number that typically produces good-looking results).
The UI for `My Light Randomizer` should now look like this:
* **:green_circle: Action**: Run the simulation for a few frames to observe the lighting color changing on each Iteration of the Scenario.
* **:green_circle: Action**: Run the simulation for a few frames to observe the light color changing on each Iteration of the Scenario.
You may sometimes need to bundle certain randomization-related data or logic within an object that are inherent to the object itself. For instance, you may have multiple lights in the Scene but would like each of them to have their own unique range of intensities. It would be quite tedious to add a new Parameter to your light Randomizer for each of your lights. Furthermore, this would make your light Randomizer excessively tailored to one use-case, limiting the Randomizer's reusability.
You may sometimes need to bundle certain randomization-related data or logic within an object that are inherent to the object itself. For instance, you may have multiple lights in the Scene but would like each of them to have their own unique range of intensities. It would be quite tedious to add a new Parameter to your light Randomizer for each of your lights just to achieve this. Furthermore, this would make your light Randomizer excessively tailored to one use-case, limiting the Randomizer's reusability.
There are also cases where you may need to include certain logic within your object in order to make the Randomizer code more reusable and easier to maintain. For instance, you may want to build an office chair Prefab to use in various simulations. This chair is likely to support a range of customizations for its various parts (back angle, seat angle, seat height, etc.). Instead of directly mapping a Rotation Parameter from a Randomizer to the rotation of the back angle object within the chair, it might be more convenient to have the chair expose the range of possible angles in the form of a simple float between 0 and 1. With this approach, the Randomizer would only need to sample a float Parameter and assign it to the chair. The chair would in turn have a script attached that knows how to map this single float to a certain plausible back angle. You could even map this float to a more complex state of the chair. Your Randomizer would still only need one float Parameter.
* **:green_circle: Action**: Change the Y rotation of `Directional Light (1)` to 60, as shown below:
* **:green_circle: Action**: Change the Y rotation of `Directional Light (1)` to **60**, as shown below:
* **:green_circle: Action**: Change the Y rotation of `Directional Light` to -60.
* **:green_circle: Action**: Change the Y rotation of the original `Directional Light` to **-60**.
This makes the two lights illuminate the scene from opposing angles, each having a 30-degree angle with the background and foreground planes. Note that the position of Directional Lights in Unity does not affect how they illuminate the scene, so you do not need to use the same position as the screenshot above.
}
```
In the above code, we have created a new `SetIntensity` function that first scales the incoming intensity (assumed to be between 0 and 1) to our desired range and then assigns it to the light's intensity. The `Light` component is now fetched from the GameObject that this Randomizer tag is attached to. This works because both this tag component and the `Light` component are attached to the same object in the Scene (which is one of the lights).
In the above code, we have created a new `SetIntensity` function that first scales the incoming intensity (assumed to be between 0 and 1) to our desired range and then assigns it to the light's intensity. The `Light` component is now fetched from the GameObject that this Randomizer tag is attached to. This works because both this tag component and the `Light` component are attached to the same object in the Scene (which is one of the directional lights we created).
* **:green_circle: Action**: Select `Directional Light` and from the **Inspector** UI for the `MyLightRandomizerTag` component, set `Min Intensity` to 0.5 and `Max Intensity` to 3.
* **:green_circle: Action**: Repeat the above step for `Directional Light (1)` and set `Min Intensity` to 0 and `Max Intensity` to 0.4.
* **:green_circle: Action**: Select `Directional Light` and from the **Inspector** UI for the `MyLightRandomizerTag` component, set `Min Intensity` to **0.5** and `Max Intensity` to **3**.
* **:green_circle: Action**: Repeat the above step for `Directional Light (1)` and set `Min Intensity` to **0** and `Max Intensity` to **0.4**.
Note that with this change, we fully transfer the responsibility for the light's intensity range to `MyLightRandomizerTag.cs` and assume the intensity value coming from `My Light Randomizer`is always between 0 and 1. Therefore, we now need to change the range for the corresponding Parameter in `My Light Randomizer` to (0,1).
Note that with this change, we fully transfer the responsibility for the light's intensity range to `MyLightRandomizerTag.cs` and assume the intensity value coming from `My Light Randomizer`to always be between 0 and 1. Therefore, we now need to change the range for the corresponding Parameter in `My Light Randomizer` to (0,1).
* **:green_circle: Action**: Select `SimulationScenario` and from the UI snippet for `My Light Randomizer`, change the range for `Light Intensity Parameter` from (0.5,3.5) to (0,1).
* **:green_circle: Action**: Select `SimulationScenario` and from the UI snippet for `My Light Randomizer`, change the range for `Light Intensity Parameter` from (0.5,3.5) to **(0,1)**.
We also need to make a minor change to `MyLightRandomizer.cs` in order to make it compatible with this new approach.
}
```
Notice how we now fetch the `MyLightRandomizerTag` component from the tagged object and use its `SetIntensity` function instead of directly setting the intensity of the `Light` component.
Notice how we now utilize the `SetIntensity` fucntion of `MyLightRandomizerTag` components of the tagged objects, instead of directly setting the intensity of the `Light` components.
* **:green_circle: Action**: Run your simulation, then pause it. Go to the _**Scene**_ view and inspect the color and intensity of each of the lights. Try turning each on and off to see how they affect the current frame.
GitHub
4 年前