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1. Take a sphere from the GameObjects.

2. Select and import a polybrush from package managers in windows menu.

3. select the poly brush window and from there select the 'sculpt on meshes' and click and play around to practice sculpting .

4. Select the shaders folder from the project section and right click on standard texture and creat a new material  and drag and drop textures onto the texture tab .

then link that material onto the GameObject . 

5. Then on the polybrush section , select 'paint texture on meshes' option and and once you select the gameobject you can see the textures that are added on the brush. Now simply paint on the sphere to create the desired look on the planet.

6. To add trees and other objects , select the "scatter prefabs on meshes " option in polybrush and drag and drop the prefabs of the assets onto Current pallette. select the item and paint on the sphere.

1. In the GameObjects tab select 3D and select Terrain.

2. Keep the Terrain selected from the Hierarchy and on the inspector select brush tool and from the popup select  Raise or Lower Terrain.

Then use the brush on the selected terrain by clicking to raise and Shift+ left click to lower the terrain.

3. Then on the same brush tool choose Paint Texture. Make sure you have downloaded / your own terrain texture assets and it has been imported to your project. In terrain layers, go to Edit Terrain Layers and choose Create  Layer. Then add a base texture for your terrain. Here i chose Snow.

4. In Edit Terrain Layers , choose Add Layer and select the layer you want from the pop up and then paint it over the region you want.

by Student of VIT Bhopal(CSE with specialization in Gaming technology)