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Reflections Part Two

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Important If you have not read the first part, click this link.
In this tutorial I will explain how to use images for reflection use the mentalrayIbl.

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Images

The first thing you've got to consider is what your image will be doing in your Maya scene. Will it be reflecting, or reflecting and generating light for your scene. For most of the time you will be using an image to add reflections and light to your scene. Example; A highly detailed car rendering.

Setting an image to add reflection to your MR Maya scene

Create a new scene.
Import the object you want to use, or use the robot you can download below.
Create a polygonal plane and stretch it out to create the floor.
Assign a blinn shader to the robot.
Open the RSW window and set the rendering software to MR.Under quality presets, set the presets to production quality.
Roll down to the bottom of the RSW. You should see the create image based lighting button.
This will create a mentalrayIbl node
With the mentalrayIblShape1 selected set image name to the location where the reflection image is saved.
Render it.

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Setting an image to add reflection and light to your MR scene

Repeat the section above. Only this time, check final gather in the RSW.
You could render it right here and you would see improved lighting but there would be no shadows and the light quality would not be as good

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Select the mentalrayIblShape1 . Under it's attributes, roll down to light emission. Check emit light.

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Quality U = sets how many lights will be generated from sampling from the U in the UV coordinates (The higher the number here will mean that the render quality will be higher, but expect long render times)

Quality V = sets how many lights will be generated from sampling from the V in the UV coordinates(The higher the number here will mean that the render quality will be higher, but expect long render times)

Samples = how many times mental ray will sample the image for it's light values.

Shadow color = I recommend most of the time you leave this attribute gray scale. The lighter the shadow color, the lighter the shadows.

Ray depth limits = the higher this number the more detailed the shadow will be.

Adjust light emition color effects = check this attribute and you can adjust the overall light emition colors.

Invert = inverts the light colors.

Color gain = the darker this attribute the darker the overall light emition will be.

Color offset
= the lighter this attribute the lighter the overall light emition will be

Now set the settings to the image below.

click to enlarge

Render it. There you have it. You should see a well lit reflective object in the scene.

http://www.3dtutorialzone.com/tutorial?id=8

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