In this section, you
work with IPR (Interactive Photorealistic Rendering) for mental
The advantage of rendering
with IPR is that, after you render an image, you can adjust the
shading and lighting attributes of the scene and then quickly update
part or all of the rendered image to review the effect of your changes. IPR
is useful for iterations when you need to fine-tune specific attributes. Updates
to the image are not always instantaneous, but they are full quality.
Using the mental ray for
use IPR for mental ray rendering, you must first select the mental
ray for Maya renderer.
To turn on the mental ray for Maya renderer
- In the main menu, select
Window > Rendering Editors > Render Settings (or
click the Render Settings icon in the Render
- In the Render Settings window,
set Render Using setting to mental
To render the scene using IPR
- In the perspective view, select View
> Camera Attribute Editor to display the attributes
for the camera.
You need to specify the
exact region of the perspective view you want to render.
- In the Attribute Editor,
open the Display Options section and
turn on Display Resolution.
A dark green rectangular
border shows the region to be rendered. This region defines the
area of the final image, and allows you to decide what appears or
does not appear in the final image. (The left and right borders of
the rectangle may be positioned at the edge of the window.)
Render > IPR Render Current Frame (or
select the IPR render current frame button on the Status
View appears as follows.
The message displayed
at the bottom of the IPR Render View window states “Select a region
to begin tuning”. In the next step, you create a subregion of the
image to render using IPR.
- In the Render View,
select View > Frame Image to resize
the Render View window so it fits
closely to the rendered image.
To select a subregion to render using
- In the Render View,
drag a selection box around the small area surrounding the apple,
counter, and wall as shown:
using IPR, this selected region updates as you alter any shading,
texture, or lighting attributes. Selecting a smaller region quickens
the update. You can select regions throughout the image to see those
- In the scene view, right-click the wall
and select Material Attributes to display
the Attribute Editor for the Lambert
shader you applied to the wall.
- Click the Color box
and change the color to green.
The area within the selected
region of the Render View updates immediately
as you alter the color; the wall turns green.
When you drag within the color wheel of the Color
Chooser window, the selected region updates occur immediately.
NoteIf the region does
not update, in the Render Settings window, turn the Raytracing option
(You won’t alter any
other attributes in this lesson. The purpose of the lesson is to
learn the process of rendering, not to perfect the results at this point.)
So far, you’ve used IPR
to see changes you made to a shader. If you add lights to the scene
rather than using default lighting, you can also use IPR to help adjust