SpriteNodeMaterial: size attenuation support orthographic camera

[RenaudRohlinger]

Description

Adjusted sprite scaling for orthographic cameras when sizeAttenuation is false by adding:

const orthoScale = float(2.0).div(cameraProjectionMatrix.element(1).element(1));
scale = scale.mul(orthoScale.mul(2));

We calculate orthoScale as 2.0 / cameraProjectionMatrix[1][1] to obtain the camera's vertical size, and then multiply by 2 to adjust for the normalized device coordinate (NDC) space ranging from -1 to 1. This ensures sprites scale correctly in orthographic projections, maintaining consistent sizes on the screen regardless of the camera's zoom level.

This contribution is funded by Segments.AI & Utsubo

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	687.15 170.18	687.15 170.18	+0 B +0 B
WebGPU	805.82 216.97	805.89 216.99	+69 B +24 B
WebGPU Nodes	805.33 216.83	805.39 216.85	+69 B +24 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	462.85 111.79	462.85 111.79	+0 B +0 B
WebGPU	535.59 144.55	535.66 144.58	+69 B +26 B
WebGPU Nodes	491.75 134.31	491.75 134.31	+0 B +0 B