Under PARTproject -> Edit project -> tabbed page General -> Render attributes -> Render material you can choose the render material for the selected part.

Under Render material, call the respective dialog Render Materials by clicking on the button ....

With a click on apply lines for render materials and then enter an ID and a Name for each material.

In order to edit the 3D preview, click on the ... button right beside 3D preview.

-> The dialog box Edit material for 3D preview is opened. It shows a dummy part, which mirrors all performed adjustments.

Settings

In the upper dialog area adjust Color, Transparency, Percentage Metallic and Roughness.

Dialog box "Edit material for 3D preview"

For appropriate materials you can also use Transparency.

In the below dialog area you can load image files for Color texture and Normalmap (bumpmap).

Dialog box "Edit material for 3D preview" - Using Color texture and Normalmap

In the above figure a Color has been used in addition. In order for it to be used for the 3D view, you have to check Mix color with color texture.

In particular adjust Scale, that the texture is optimally wrapped around the model (repeating of pattern). With Height you can adjust the hight of "bumps".

Confirm with OK.

-> Now you are in the dialog Render Materials again.

In this way you can define any number of materials.

Also close this dialog now by clicking OK.

The applied materials can now be selected under Render material.

Test the part in PARTdataManager.