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Modeling Fundamentals

TECHNIQUE
📖3 min read

Introduction​

You've learned to navigate Blender, read perspective, and document your work. Now you build. But "building" in an investigation is not the same as building in film or games. A cinematic model only needs to look right from the angles it's filmed from. An investigative model must measure right from any angle, because it has to stand up to checking.

This module covers the modeling workflow and the core techniques you'll rely on. It's a survey, not an exhaustive tutorial; the deep detail lives on the reference pages.

The Investigator's Modeling Workflow​

Most reconstruction modeling follows the same arc:

  1. Reference first: import your source (photo, scan, measurement) before you model. The reference drives the model, never the reverse.
  2. Establish scale and origin: set a known distance and a known floor. Without scale, your model is a toy; with it, it's evidence.
  3. Block out the large forms: get the big shapes and proportions right before any detail.
  4. Add detail where it matters: detail is expensive (in time and in error). Spend it where it affects the conclusion.
  5. Verify against the source: check your model against the reference from the same viewpoints.

The Key Techniques​

TechniqueWhat it's forReference page
Reference modelingModeling a clean, editable mesh from a photo or scanReference Modeling
Direct modelingThe core vertex/edge/face operations (extrude, bevel, inset, …)Direct Modeling
Boolean modelingCutting and combining shapes (doorways, intersections)Boolean Modeling
Precision modelingHitting exact dimensions from measurementsPrecision Modeling
Mesh repairFixing broken geometry from scans or importsMesh Repair

Note the pattern: strategy (how to approach the problem) vs. technique (a specific operation). Reference modeling is a strategy; extruding a wall is a technique. Keep the two levels distinct and the techniques stay findable.

Destructive vs. Non-Destructive​

A critical habit: keep your work reversible. Use modifiers, keep original objects, and avoid baking in changes you can't undo. In an investigation you will be asked to change an assumption — a wall that was 3m might be 2.7m. If your model is built non-destructively, that's a one-number edit. If it's baked, it's a rebuild.

Exercise​

Model a simple room from a photo (a corner with two walls and a floor is enough):

  1. Put the photo behind a camera in Blender (as a background image) and match the camera to it.
  2. Block out the two walls and the floor as three planes/cubes, using the perspective to get proportions right.
  3. Set a known scale: assume one wall is, say, 3m tall, and scale accordingly.
  4. Add one doorway using a boolean cut.
  5. In your decision log, record the scale assumption and the wall dimensions you used.

The goal is a clean, scaled, editable room, not a beautiful one.

Summary​

  • Import your source before you model. The reference drives the model, never the reverse.
  • Set scale and origin early. Without scale a model is a toy; with scale it is evidence.
  • Add detail only where it affects the conclusion. Detail costs time and adds error.
  • Keep strategy and technique as two levels. Reference modeling is a strategy; extruding a wall is a technique.
  • Keep the work reversible. A non-destructive model turns a changed assumption into a one-number edit.

Resources​