[FIX] Fix glTF spot light default cone angle

[willeastcott]

Fixes incorrect default outerConeAngle when loading spot lights from glTF/GLB files.

Changes

• Fixed outerConeAngle default value from radians to degrees
• Added safe fallbacks for cone angles in luminance calculation
• Fixed typo in comment ("clapms" → "clamps")

Technical Details

The glTF KHR_lights_punctual extension specifies cone angles in radians with a default outerConeAngle of π/4. When converting to degrees, this default was incorrectly left in radians.

Before:

lightProps.outerConeAngle = gltfLight.spot.hasOwnProperty('outerConeAngle') ? gltfLight.spot.outerConeAngle * math.RAD_TO_DEG : Math.PI / 4;

After:

lightProps.outerConeAngle = gltfLight.spot.hasOwnProperty('outerConeAngle') ? gltfLight.spot.outerConeAngle * math.RAD_TO_DEG : 45;

The previous code resulted in spot lights without explicit outerConeAngle having a cone of ~0.785° instead of 45°, making them nearly invisible.

Checklist

• I have read the contributing guidelines
• My code follows the project's coding standards
• This PR focuses on a single change

[Copilot]

Pull request overview

This PR fixes an incorrect default value for the outerConeAngle property when loading spot lights from glTF/GLB files. The glTF specification uses radians with a default of π/4, but PlayCanvas expects degrees, so the default should be 45° instead of the unconverted π/4 (≈0.785°).

Key Changes:

• Fixed default outerConeAngle from Math.PI / 4 (radians) to 45 (degrees)
• Added safe fallbacks using nullish coalescing for cone angles in luminance calculation
• Fixed typo in comment ("clapms" → "clamps") and improved comment clarity

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[mvaligursky]

please see the comment by copilot above, seems it might be right @willeastcott

[willeastcott]

please see the comment by copilot above, seems it might be right @willeastcott

Yep, creating a follow up PR now.