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complete newbie to Blender. I am editing some files for 3D print for personal use and was able to do most of what I need with help of this forum and YouTube tutorials, but need help with final step. I need to scale the object, but not sure how. I know that I can transform the whole object based on X, Y and Z axis.enter image description here

I need to set the distance between middle of the eyes to a specific value in mm and scale the whole model based on that. Is it possible to do something like that? If so, could you advise how? Any help would be appreciated.

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3 Answers 3

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In this example, I want Suzanne scaled to 0.5m between the centers of her eyes.

The Measure tool and type-in values can help with this. (Ensure the Scale of your object is CtrlAapplied.) In Edit Mode:

enter image description here

  1. Snap the measure tool to the reference geometry
  2. A select all
  3. S to scale, and left-click
  4. In the Scale operator's F9 'Adjust' panel, LMB swipe all fields to make simultaneous entries, and type in: Desired Length / Measured Length
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(Using Blender 3.6.8)

Approach

Use two cubes as guide, combined with Snap to Vertex activated.

Setup

Using the middle top icons of the 3D Viewport:

  • Set Transform Pivot Point to Individual Origins.
  • Set Snap to to Vertex, and set Affect to Move and Scale.

Step 1

Step1 Position reference cube

1. Set the cursor location to a first reference position (e.g. the centre of Suzanne right eye).
2. Displace the object to scale origin to the cursor location (menu Object/Set Origin/Origin to 3D Cursor).
3. Add a cube (menu Add/Mesh/Cube).
4. Scale it such that one of its dimensions (e.g. X) matches the specific sought value (menu Object/Transform/Scale).
5. Apply the cube transformations (menu Object/Apply/Scale).
6. Set the cursor location to one corner of the cube.
7. Displace the cube origin to the cursor location.
8. Select the object to scale and move the cursor to its origin (Shift S 2 Cursor to Selected).
9. Select the cube and move its origin to the cursor location (Shift S 8 Selection to Cursor).

At this stage, the object to scale and the cube are sharing the same origin, and one side of the cube matches the sought length.

Step 2

Step2 Position guide

1. Select the cube and duplicate it without displacement (menu Object/Duplicate Objects).
2. Set the cursor location to the corner opposite to the origin of the copied cube.
3. Scale the copied cube moving the mouse such that the cursor snaps to the second reference position (e.g. the centre of Suzanne left eye).
4. Apply the copied cube transformations.

At this stage, one side of the copied cube matches the original length of the object to scale.

Step 3

Step3 Scale guide to match reference cube

1. Add a Copy Scale constraint to the object to scale.
2. Choose the copied cube as Target.
3. Select the copied cube.
4. Set the cursor location to the corner opposite to the origin of the copied cube.
5. Scale the copied cube moving the mouse such that the cursor snaps to the right corner of the original cube.
6. Select the object to scale and Apply the constraint to freeze the scale.

Resources:

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Copy scale from Suzanna to target (Scaled Cube) with Power -1. enter image description here

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