Obviously try to reduce the amount of snow where there is cover, or where there was cover. Try to think about how it should look where are the hotspots that would leave less snow what kind of shoes a person uses, and how he walks. Then you just start digging into the snow, removing it where needed. For this one I used a dark gray since I won't be digging much so: R:77 G:77 B:77 (Fig.02). It would be wise to study your scene to figure out what will be needed most. In Photoshop you should not begin painting with a white canvas, as you will be unable to have negative displacement, so instead pick a colour that will give you enough leeway in both positive displacement and negative displacement. Now created an orthographic camera on top of your scene and make a render to use as a guide in Photoshop. Increase the texture size depending on the scale and level of detail you want. Tweaking will be necessary on the second plane I found Z:-0.4 was good for me. The top one will be the standard ground positioned at Z:0.0, and the second will be just underneath it. I used centimeters for this one (Fig.01). Always remember to select your scale before starting a new project.
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