Missing Two-Point Constraint for Modular Geometry Along Curves— Need Dual-Anchor Placement for bricks

🧱 Idea Breakdown (Dual-Anchor Curve Placement)

🔹 The Problem

• When placing objects along a curve in Blender (Array + Curve or Geometry Nodes), alignment is based on the object origin (center).
• This works fine for simple shapes, but breaks for modular objects that need to connect at specific edges.
• In this case, retaining wall blocks are trapezoidal and designed to form curves.

🔹 Why the Current System Fails

• Each block has two connection sides (left and right faces).
• For correct placement:
  • Left side connects to previous block
  • Right side connects to next block
• Blender only aligns using:
  • One point (origin)
  • One direction (tangent)
• This causes:
  • Rotation around center instead of edge
  • Gaps and overlaps on curves
  • Unrealistic results

🔹 What Is Needed (Core Idea)

• Support for two anchor points:
  • Anchor A (start)
  • Anchor B (end)
• Placement logic:
  • Anchor A snaps to curve point i
  • Anchor B snaps to curve point i+1
• Object transform is computed from these two anchors

🔹 Why This Matters

• Many modular systems require edge-to-edge alignment:
  • Retaining wall blocks
  • Bricks
  • Tiles
  • Roads
  • Mechanical parts
• Current tools are not suited for this without workarounds

🔹 Expected Benefits

• Accurate modular placement along curves
• No gaps or overlap issues
• Simpler workflows for:
  • Architecture
  • Procedural modeling