Perspective API

中文 | English

Perspective API is a camera perspective management framework for Minecraft client-side mods. It provides standardized interfaces using the JOML library to handle camera states (position, rotation, FOV), decoupled from Minecraft internals.

Key Features

• Roll: Camera rotation is specified with quaternions, so roll is fully supported
• Smooth Transitions: Interpolated transitions for position, rotation, and FOV ensure natural perspective switches
• Priority-Based Override Chain: High-priority temporary perspectives (e.g., cutscenes, GUI-forced views) automatically override base perspectives
• Built-in Perspective Cycler: Takes over the vanilla F5 toggle key, allowing players to cycle through registered perspectives

Core Concepts

Perspective

A Perspective defines a camera behavior. Each perspective has a unique Identifier and implements per-frame callbacks to modify camera position, rotation, and FOV. It also exposes lifecycle hooks (onActivate / onDeactivate) and availability checks (isAvailable).

When applyTransform and applyFov make no modifications, the camera falls back to a vanilla camera type specified by cameraType().

Transitions in and out of a perspective can be individually enabled or disabled.

Perspective Registration

Perspectives can be registered via the Java SPI mechanism (PerspectiveRegistrar interface) for automatic discovery, or manually through the registry.

Override Chain

The override chain is a priority-based evaluation mechanism for temporary camera control. Each entry provides a Supplier<Identifier> evaluated by descending priority. The first entry to return a valid perspective ID wins, and that perspective is applied. This is ideal for scenarios like custom GUIs or cutscenes that need to temporarily take over the camera.

Perspective Cycler

The cycler manages the list of perspectives players traverse with the vanilla toggle key (F5). It includes three built-in perspectives corresponding to vanilla First-person, Third-person Back, and Third-person Front. Custom perspectives can be added with a priority that determines their position in the cycle.

The cycler itself acts as a low-priority override entry. If a higher-priority override is active, the cycler's selection is temporarily ignored.

Perspective Modifier

Modifiers apply additional mathematical transformations to the camera state after the base perspective establishes the target state but before transition interpolation. This is useful for effects like screen shake, movement tilt, or vehicle roll that should layer on top of any perspective.

Modifiers are registered with a key, a priority, and executed in ascending priority order.

Execution order: Base Perspective → Modifiers (by priority) → Sanitize → Transition

Adding Dependencies

Modrinth Maven

Notation format: "maven.modrinth:perspective-api:${version}+${loader}-${minecraft_version}"

repositories {
  exclusiveContent {
    forRepository {
      maven {
        name = "Modrinth"
        url = uri("https://api.modrinth.com/maven")
      }
    }
    filter {
      includeGroup("maven.modrinth")
    }
  }
}

dependencies {
  implementation("maven.modrinth:perspective-api:1.0.0-beta.1+fabric-26.2")
}

Demo

See the demo mod Perspective API Demo.