Conditions

2m 49sPublished Sep 25, 2025Partial

SummaryVersion Notes (Draft)

The primary teaching objective of this course is to master the setup of logical Conditions on transition wires and learn the baseline workflow of leveraging Rive's scalable "View Model" architecture to drive responsive interface components.

In legacy interactive workflows, motion states usually depend on disjointed global variables or rigid code listeners, creating massive logic overhead for complex UI states. Rive solves this by incorporating the engineering concept of "View Models." By mapping data matrices directly to an Artboard, designers declare Number, Boolean, and Trigger properties inside a dedicated Data Panel. These variables map as physical access gates (Conditions) on any transition lane, assuring full, data-driven control over interactive runtime visual assets.

Modern Architecture with View Models: Compared to legacy workflows where inputs were forged directly inside isolated state machine panels, Rive strongly advocates mapping attributes via View Model Properties. This separation mirrors modern front-end state containers (e.g., React or Vue hooks), facilitating a direct 1:1 binding with developer codebases at runtime.
Physical Application Rules for Three Primitive Types: - Number: Tailored for continuous, progressive feedback loops like volume sliders, tracking progress meters, joystick vectors, or scroll container offsets.
- Boolean: Geared for binary state changes like switching dark mode themes, handling mute/unmute indicators, or managing open/close layout toggles.
- Trigger: Built for brief, singular impulses like firing weapons, registering button confirmations, or detecting quest completion benchmarks. Triggers instantly revert to false after firing, saving developers from manually managing state resets.
Compounding Transition Condition Cascades: While this guide displays single-variable logic gating, Rive allows designers to chain multiple sequential conditions onto an individual transition path by tapping the plus icon. Arranging multiple requirements concurrently mandates that all conditions validate successfully (AND logic evaluation) before the layout crossfades.

📌 Key Points

Use inputs as transition conditions: boolean true/false, number operators, triggers.

📝 Notes

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Step by Step

00:00:04

Defining Interactive Access Gates:

Instructor Ross introduces the core puzzle: now that we understand transitions, how do we use custom client actions or backend metrics to trigger those paths? The solution lies in View Model variables.
00:00:12

Creating and Binding View Models:

Click the active Artboard's identifier node in the top-right corner of the inspector. Choose to spawn a new View Model, which automatically establishes an architecture link between view model 1 and the vector canvas.
00:00:28

Declaring Three Core Input Variants:

Head over to the left-side Data Panel. Under the newly created view model 1 directory, instantiate three foundational types of properties, naming them num (Number), bull (Boolean), and trig (Trigger).
00:00:55

Simulating Runtime Variables in Editor:

Engage the state machine simulation to inspect data manipulation live. The number values can be altered via step controls, the boolean toggles cleanly between true and false states, and the trigger flashes true for a single micro-frame before auto-resetting.
00:01:16

Mode 1: Implementing a Number Condition:

Select the transition wire connecting the dual timelines. Navigate to the lower Conditions property inspector, click the plus icon, link it to the num field, and hardcode the constraint logic statement to read if num > 50.
00:01:34

Testing the Fractional Number Threshold:

Fire up playback. Because num defaults to 0, execution stays locked on the baseline timeline. Once the step modifier pushes the value past the 50 mark, the transition gate unlocks, seamlessly advancing to the secondary clip.
00:01:58

Mode 2: Mapping a Boolean Sizing Gate:

Delete the number logic block and instantiate a fresh boolean condition statement: if bull == true. Previewing the graph shows execution stalls until the checkbox is ticked to true, driving an instant layout shift.
00:02:24

Mode 3: Deploying Pulse Triggers and Wrap-up:

Clear the property lane one last time to configure the pulse variable trig. Run the timeline simulator, find the asset stalled on frame one, tap the trigger node to shoot a momentary pulse, and witness the workflow complete its final state jump cleanly.