Regenerates shadow maps and renders the scene again. Any time you move a light that uses shadow maps, or change the geometry, click Render to recompute depth and shadow maps.

This is disabled if you have not selected an output node to render.

Restarts the current render. This will usually have no effect other than to recreate the exact same image.

Pauses rendering. Click again to resume.

Stops rendering the scene. This is disabled if the view is not currently rendering.

Choose the output node you want to render.

Opens a floating parameter editor for the selected render node.

Choose the camera you want to render through. You can set this to “ROP Camera” to use the camera specified on the render node, or “Scene View” to use the perspective from the Scene View.

Opens a floating parameter editor for the selected camera node.

When this option is on, any parameter changes make the render view re-render. This lets you make changes in a node’s parameter interface and see the results in the render view interactively.

If you turn this option off, use the Render button at the left end of the toolbar when you want to update the render view manually.

When this option is on, the view will show progressively more detailed previews of the scene as it renders. This makes the final output take a little longer but lets you get a sense of what the image will look like much faster.

Whether to use the relighting buffer in the preview.

When this is on, mantra keeps a copy of the previous render. When a new pixel is rendered, mantra compares the new value to the value in the previous render. It uses the difference to influence the preview of nearby pixels, on the theory that neighboring pixels will generally update similarly. Mantra also uses the buffer to concentrate on sampling areas that have changed the most.

The buffer can be very helpful when you're changing lights and shaders. It is less helpful when you make a large change such as moving objects or the camera. In that case the previous render shows as a ghost image until the image is fully rendered.

The relighting buffer exists only in memory, so killing a render will also delete the relighting buffer.

You’ll get the most accurate results if you let a render complete and then make lighting and shading changes, so the buffer contains the most possible samples.

Enables inspection of Material Style Sheets in the IPR viewer. Mantra will generate extra data to track which style sheets are applied at each pixel. The full evaluated style sheet can be found by ⌃ Ctrl + clicking on a pixel in the rendered result. ⇧ Shift + ⌃ Ctrl + click will open the style sheet in a Data Tree pane tab.

Enables the NVIDIA OptiX denoiser. The denoiser plugin is not installed, this button is disabled.

(In IPR, the denoiser always uses the “basecolor” image plane (if it exists) as the albedo input. On a render node, the corresponding render property lets you specify the plane to use for albedo.)

“Blur” shows large anti-aliased pixels that are refined in each pass. “Sharp” shows a grainy, aliased image that becomes less grainy in each pass.

Time (in seconds) between preview passes. Mantra estimates the number of shading samples to use for the preview based on the speed of previous previews. So, if you have a faster machine, mantra will use more shading samples to generate a better preview in the given time.

Time (in seconds) between a parameter change and the auto-update. Increasing this time lets you combine small parameter changes when updating is slow.

Opens this help page.

The pop-up menu at the left end of the toolbar controls which image is shown in the render view. Choose “Active Render” to show the active rendered image, or choose an image from the render history.

Delete the currently shown image from the render history. This button is disabled when the pop-up menu is set to “Active Render”.

Use the slider or click the previous and next buttons to move through the history of saved images.

Save the active rendered image to the render history. To give the image a unique name in the history list, enter it in the text box to the right of the button before you click it.

Click to choose a comparison method. Click the button to turn comparison on or off.

Click to choose the image to compare the current image to.

Use the slider to control the comparison. This is disabled when the Comparison method pop-up menu is set to Off.

Saves the current IPR render to a file. If the Active Render entry is selected from the snapshot menu, the render progress is saved. Otherwise, the selected snap shot is written out. It is possible to save an in-progress render.

The file path used to write auto save images. The file path extension is used to determine the image format. Enabled when the Auto Save button is toggled on.

When this option is on IPR render progress is periodically saved to disk. The image is written to the auto save path.

Time (in seconds) between automatic image saves. Enabled when the Auto Save button is toggled on.