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Rendering Techniques > 3dsmax Vray Rendering Tutorial-Caustic Effects (Posted By: mayafishing)
:: Post Date: 2007-05-05 16:19:47 [Post Comment] [Post Articles]

3dsmax Vray Rendering Tutorial-Caustic Effects

Software Used: Autodesk 3dsmax & VRay Advanced 1,5 RC3 for 3dsmax 9

Author: Dong

Contact: yangdongmy@gmail.com

Introduction

This tutorial explains how to set up a scene with Vray caustic effects.

[Rendered without Caustic Enabled]

[Click Here for Larger Image]

[Rendered with Caustic Enabled]

[Click Here for Larger Image]

As you can see, the difference is very clear. With beautiful caustic effects, the whole scene becomes more vibrant and vivid with extra realism.

Steps to Set Up Caustic for the Scene (Download the scene file at the end of tutorial.)

Step 1: As you can see, the scene is really simple. It has only one Vray light and a simple plane polygon represents the table cloth and a set of tea cup.

[Click Here for Larger Image]

[Click Here for Larger Image]

First, you need to set up a Vray light. Go to "Create" -> "Lights" -> "VRay" -> "VRayLight". Set the "Color" to light yellow and "Multiplier" to "2.0".

[Vray Light Settings]:

[Click Here for Larger Image]

Note: You need to place the Vray light at a good distance from the tea cup object. The direction of caustic photons will be casted according to the position of the Vray. You can experiment with the position to get different effects.

Step 2: Set up table cloth material as the diagram below: (the texture map is included in the scene file.)

[Click Here for Larger Image]

Step 3: Set up tea cup material as the diagram below:

Under "Reflection", set "Reflect" to a dark color (R=40, G=40, B=40), the tea cup will have some reflection now. If you set this option to pure white, it means 100% reflection.

Under "Refraction", set "Refract" to white color (R=255, G=255, B=255), it means 100% refraction for tea cup. Set "IOR" (Index of Refraction) to "1.5". It is the IOR for real glass. Set "Fog color" to a light blue color (R=92, G=126, B=212). It will give the tea cup a blue color when rendered. You can experiment with this option whichever way you like. Different fog colors means different colors for the tea cup objects when rendered.

[Click Here for Larger Image]

Step 4: Go to "V-Ray: Environment", turn on "GI Environment(skylight) override" and assign a "VRayHDRI" material to the "none" button. Open up the Material Editor and drag the button to a empty material ball, choose "Instance" as selection. Now you can directly control HDRI options inside Material Editor. Choose "kitchen.hdr" as the HDR image for rendering. Set "Multiplier" to "0.4". "Map type" to "Spherical environment" so MAX will unwrap the HDR image. The whole idea is to use VRay light to cast caustic to the tea cup object and use HDR image to provide overall lighting to the scene.

[Click Here for Larger Image]

Step 5: Now it is time to set up VRay rendering parameters.

(1) Under "V-Ray: Image sampler(Antialiasing)", set "Image sampler" type to "Adaptive subdivision". Turn on "Antialiasing filter" and set type to "Catmull-Rom". (Note: when you are testing, you can use "Fixed" as "Image sampler" type). Expand "V-Ray: Adaptive subdivision image sampler", set "Min. rate" to "-1" and "Max. rate" to "2".

[Click Here for Larger Image]

(2) Under "V-Ray: Indirect Illumination(GI)", turn on "GI caustics", select "Refractive".

[Click Here for Larger Image]

(3) Under "V-Ray: Irradiance map", choose "Current preset" to "High".(Note: Select "High" will require a very long rendering time with very smooth result. If you do not have a fast machine, try "Medium" ot "Medium - animation".)

Under "Basic parameters", set "HSph. subdivs" to "15" and "Interp. samples" to "80".

Under "Options", turn on "Show calc. phase" to let VRay show all the steps when rendering so you will know at the early stage whether the rendering is going
fine.

Set the "Mode" type to "Single frame".

[Click Here for Larger Image]

(4) Under "V-Ray: Caustics", turn on caustic. Set "Multiplier" to "4.0", "Search dist." to "5.0", "Max photons" to "5000". You need to adjust these values according to the set up of your lights and objects. If you are using the downloaded scene, it is ok to leave them with these values.

[Click Here for Larger Image]

(5) Under "V-Ray: System", click on "Lights settings...", in the opened window, select "VRayLight01", set "Caustic subdivs" to "2000", it will give smoothed caustic result.

[Click Here for Larger Image]

(6) Under "V-Ray: System", click on "Object settings...", in the opened window, set options as showed in the following diagram.

[Click Here for Larger Image]

[Final Render Result:]

[Click Here for Larger Image]

[Other VRay Tutorials On Site:]

3dsmax Vray Tutorial - Render with Sunlight

[Download Scene File:]

The scene file includes: .MAX file for 3dsmax 9.
Download Scene File [226KB].

Comments: (Currently there are 8 comments.)
- [Anonymous]anhthanh ( 2008-08-08 22:21:55 ) [Post Comments]
- ok
- [Anonymous] ( 2008-06-22 17:24:29 ) [Post Comments]
- its very n ice of you thanks
- [Anonymous]BHargav ( 2008-05-24 13:08:26 ) [Post Comments]
- coooooooooooooooooool
- [Anonymous]oooooooo ( 2008-01-12 08:58:53 ) [Post Comments]
- Q.can't working v ray render in 3ds max8. what we do?
  
  A.change ur display to direct3d
- [Anonymous]v.balamanikandan ( 2007-06-21 14:24:26 ) [Post Comments]
- can't working v ray render in 3ds max8. what we do?
- [Anonymous]imran khan ( 2007-06-16 13:24:10 ) [Post Comments]
- very nice tutorial.....
- [Anonymous] ( 2007-06-03 16:02:19 ) [Post Comments]
- I wana know how will the Performance will get affected with Vray !
- [Anonymous]Tales I. ( 2007-05-09 04:07:34 ) [Post Comments]
- Very Good!! :)
  
  Tales* fron Brazil

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