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When you start a new project, it is recommended that you first go to the Material Options window and set appropriate translations for the Revit materials in your scene, especially for the materials that use textures. The second step needed to start the rneder render is to open the Render Parameters to set the output location for the image resulting from the render. Following that you can optionally use the Maxwell Grass window to add grass parameters to your objects and press the Render button to start rendering your scene.
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