Make Mountains in Blender from Heightmaps

Category

Last modified

22 July 2018
Mt Ruapehu and Mt Ngauruhoe model from SH1

Introduction

Blender can make mountains from heightmaps, and this is a tutorial to show you how. The heightmap I've used is represented by a grayscale bitmap. Black being the lowest point, white the highest. Blender is able to deform a mesh based on the pixel colour of a texture.

This tutorial is for Blender versions 2.5 through to 2.79b.

Open Blender

When Blender is first opened there is a cube in the middle of the screen. To delete this, Right Click RMB on the cube >> X >> ENTER.

Mt Ruapehu and Mt Ngauruhoe model from north
Mt Ruapehu and Rangipo Desert

Looking at Mt Ruapehu past the Rangipo Desert from State Highway 1.

Download a Heightmap

You will need a heightmap to work with. Download Mt Ruapehu and Mt Ngauruhoe Heightmap.png. These are two mountains found on a volcanic plateau in the North Island of New Zealand. You can make your own heightmaps by opening your favourite photo editor or painting program and using a grayscale palette to draw high areas in lighter shades and low areas with darker shades.

The heightmap was created by University of Otago - National School of Surveying who have published it at Koordinates, and is released under a Creative Commons Attribution-Share Alike 3.0 license.

Mt Ruapehu and Mt Ngauruhoe Heightmap

Add a Grid

Add a mesh grid with 513 subdivisions by:-

  1. Move your mouse pointer into the 3d viewport.
  2. SHIFT A will bring up a menu.
  3. Select Grid.
  4. In the Toolshelf, bottom left of the window, set the X & Y subdivisions to 513.

02 Subdivide Grid

01 Construct a grid Mesh
03 Add New texture

Import the Heightmap

Click on the Texture Icon Texture icon in the Properties Icon Properties viewport.

Click on the New button.
New Texture Button

Click the Open button under Image and navigate your filesystem to find your heightmap.
Open texture

Scroll down and change the image mapping from Repeat to Extend. This will prevent artifacts occurring at the edge of the model.
05 Extend Image Mapping

Displace the Grid

Click on the Modifier IconModifiers icon in the Properties IconProperties viewport and add a Displace Modifier IconDisplace modifier.

Click on the modifier's texture icon and select the heightmap.
07 Choose Texture

06 Add Displace Modifier
08 Initial Displacement Result

Initial displacement result.

09 Midlevel and Strength Values

Change the Midlevel value to 0 and the Strength to .135.

Changing the midlevel moves the model up so the bottom is on the grid in the viewport. The strength corrects the height of the terrain. For other heightmaps a different strength value may be needed.

Below is proof of accuracy. The height of Mt Ruapehu is 2797m, Mt Ngauruhoe is 2287m, and the distance between them is 15,825m. A red box shows these distances below:-

Proof of Scale for Mt Ruapehu and Mt Ngauruhoe

Proof of scale.

Improve the Quality

The model is coarse. We can bring out more detail by subdividing the mesh further. Subdivision can slow your computer so we will tell Blender to display a low level when working on the model and then change to high at render time.

Add the Subdivision Surface Modifier Icon Subdivision Surface modifier.
10a Subdivision Surface Modifier

It will appear below the Displace modifier. We need to move it to the top of the stack so that it is applied first. Click the 10b Modifier Up up arrow button.

Change the subdivision method to Simple.
10c Subdivision Method
 

Change the level of subdivision for View. 3 is optimal, but if your computer becomes sluggish, or crashes, then leave it as 1. Render at 3.
10d Number of Subdivisions

10e Modifier Stack
Mt Ruapehu

Closeup of the model.

12 Smooth Shading

Smooth the Model

Looking closely at the terrain you will see it is made up of 'squares'. We can improve this by selecting the Smooth shader from the Toolshelf on the left of the window.

13 Smoothed Mountains

The smoothed model at the 3rd level of subdivision.

Discussion

Arthur
Omg, dude, pretty perfect job, thx u so much
John Flower

You’re welcome.

Yiwei
This is awesome! So glad you shared it. THX :-D
John Flower

You're welcome.

Robert
perfect! nice and easy...it works perfectly!
John Flower

You're welcome.

Paige Winkle
Thanks so much! time to CNC some mountains!
John Flower

It'd be interesting to see your results, Paige.

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