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Let's start with the first render settings.

Connect the LowRes object node to the left input of the V-Ray BakerTool node.

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 For this purpose, the lowRes object needs to have UVs and normals. The V-Ray BakerTool needs to be in Baking mode "Maps Baking". 

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Render Element

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Go to the V-Ray BakerTool node.

In the Output tab, enable the World Position option.

Enable a Custom Operator as well and make sure that both of those options are saved in 32-bit format.

The render Output has to be saved in an .exr format.

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The Custom Operator is a V-Ray Color texture with input tied to the normal output of a V-Ray TexSampler.

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In the Renderer tab of the V-Ray Baker Tool, set the Sampler to Bucket.

Make sure that the Noise threshold Threshold is set to 0.005 and the Max Subdivs to 24 - these are the default values.

Once done, press click the Execute Baking Bake Now button.

Wait for the map to be exported.

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Step 2: Second Render

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For the second render, connect the LowRes object to the left input of the V-Ray BakerTool and the HighRes object to the right input of the V-Ray Baker Tool.

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Baking Settings

 

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Set the Baking Mode to Projection Baking as we did for the first render.

Select the Closest Mode and set the Normals to Geometry.

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Render Settings

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Go to the Render tab and select the Bucket Sampler with its default the same parameters values as those for the first render:

Noise Threshold = 0.005

Max Subdivs = 24

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Render Element

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Here we need only one render element. Keep the Output in an .exr format.

In the World Position we need to place information about the coordinates of the HighRes projection points onto the LowRes object.

Press Click the Execute Baking Bake Now button and wait for the map to bake.

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Step 3: Displacement

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