Add double3x3(double4x4) constructor to extract upper left 3x3 from 4x4?

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
62/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
csharp
Domain
tooling

Research direction

Start by locating the existing float3x3(float4x4) constructor and compare its behavior with the requested double3x3(double4x4) constructor. Done means double3x3 can be constructed from a double4x4 by extracting its upper-left 3x3 portion, with matching coverage for the new behavior.

Written by the indexing model from the issue text.

Description

float3x3(float4x4) exists, but the equivalent for double3x3 does not.

Dominant language
C#
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