36 lines
1.3 KiB
TypeScript
36 lines
1.3 KiB
TypeScript
import { Mat4 } from "../math/Mat4"
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import { Vec3 } from "../math/Vec3"
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/** First-person camera. Orientation is Euler yaw/pitch (no roll), which is all
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* an FPS needs and avoids gimbal bookkeeping. */
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export type Camera = {
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position: Vec3
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/** Rotation around +Y, radians. 0 looks toward -Z; increasing turns right. */
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yaw: number
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/** Look up/down, radians. Positive looks up. Clamp near +-pi/2 to avoid flip. */
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pitch: number
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/** Vertical field of view, radians. */
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fov: number
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}
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export namespace Camera {
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/** Unit forward direction implied by yaw/pitch. */
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export function forward(cam: Camera): Vec3 {
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const cp = Math.cos(cam.pitch)
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return {
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x: cp * Math.sin(cam.yaw),
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y: Math.sin(cam.pitch),
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z: -cp * Math.cos(cam.yaw),
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}
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}
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/** Combined projection * view matrix for the given viewport aspect ratio.
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* Near/far are fixed; far only needs to exceed the fog distance, and is set
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* wide enough to reach the outdoor world's distant peaks. */
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export function viewProjection(cam: Camera, aspect: number): Mat4 {
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const eye = cam.position
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const view = Mat4.lookAt(eye, Vec3.add(eye, forward(cam)), { x: 0, y: 1, z: 0 })
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const proj = Mat4.perspective(cam.fov, aspect, 0.05, 260)
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return Mat4.multiply(proj, view)
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}
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}
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