basic vray tutorial

Basic VRAY Tutorial

http://www.joepizzini.com/VRAY/Tutorial.htmظ.ب 04:24:24 2006/08/01

Basic Techniques For Vray AdvancedThis tutorial is intended to get you started using Vray. If you find something that you think Ineed to change please email me.

Here are some other sites with Vray tutorials that I find useful:

www.chaosgroup.com/support (you will have to register) click on "V-ray docs" and open the HelpIndex.

www.aversis.be

www.vray.info

www.evermotion.org

VRAY Forums

Click on a link to jump to that section or start on section one below.

1. Exterior Lighting

2. Environment Adjustments

3. Night Scene

4. VRAY Light Material

5. Color Bleeding

6. VRAY Toon

7. Interior Lighting

8. HDRI Lighting

9. Basic Material Settings

10. VRAY Displacement

1. Exterior Lighting

Basic VRAY Tutorial


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1.1 Download Basic_VRAY_Tut_Start.max

1.2 Render the scene. You should get something silimal to the image above. Here are the basicVRAY settings I use for exterior Lighting:

< Turn off Default Lights.

< Use Adaptive Subdivision (fornow)

-

< Make sure GI is turned ON.

Basic VRAY Tutorial


< Primary Bounces: Irradiance Map(IR Map)

< Secondary Bounces: Quasi-MonteCarlo (QMC)

< GI Environment: Check OverrideMax's and set color to the ambientcolor of your choice (SceneDependant)

< Reflection/Refraction: CheckOverride Max's (this isn't importantnow but it will be for HDRI lighting)

< QMC Sampler: these settings maybe a little high for now but we'll getinto that later.

< Current Preset: Set this to custom.

< Make sure the settings are the same(note these settings are optimized forfast render times) Click show calcphase if you want to see what VRAYis doing during the IR Map passes.

<Advanced Options: Blah, blah andmore blah.

< Leave this alone as well

< Sure why not?

2. Environment Adjustmnets

Basic VRAY Tutorial


Here is an example of what can happen to a scene if the environment is too high. As you can seethe entire image looks blown out and oversaturated.

Setting the GI environment to .6 caused the result above.

Note: The "blown out" effect is also due to the Target direct Light in the scene. In combination withlights, high GI Environment multipliers can cause unwanted results. By contrast it is possible to lighta scene using only the GI Environment.

2.1 Increase the GI Environment Multiplier to 1.0 and turn off the Target Direct Light (Direct01)

2.2 Render the scene

Basic VRAY Tutorial


As you can see this approach produces shadows that are very soft and undefined. This method maywork for you depending on the look you are after. You can add a bitmap to the GI Environment byclicking "None" and browsing to a bitmap of you choice. (Adding a bitmap to the GI environment issimilar but but the same as HDRI lighting which we will cover later on)

3. Night Scene

Even on the darkest nights in the middle of nowhere there will always be some sort of "ambient light"(varying degrees of course). Light from the stars, moon, or like in many night scenes, light fromsurrounding buildings and gereral "civlilization" can create enough ambient light to see anobject...even if the object has no light source of its own. (All of this depends on the scene you arerendering) A good way to get this general ambient light is to use the GI environment.

Basic VRAY Tutorial


3.1 Set you GI Environment to .4 and pick a similar color to the one below.

3.2 Make sure the light Direct01 is off and then select and turn on the light "Inside Omni". This lightsimply provides some interior lighting so its not so dark.

3.3 Render the scene and you should get something similar to the image above.

4. VRAY Light Material

Basic VRAY Tutorial


The VRAY light material allows you to create a light out of any piece of geometry. I applied a VRAYlight material to the sphere on top of the structure.

4.1 Open the Material Editor (M), click on an empty material slot and click the top right button thatsays "Standard". (If the button says VRayMtl then you didn't select an emty slot)

4.2 When the Material/Map browser opens select VRayLightMtl near the bottom of the list as shownbelow:

Basic VRAY Tutorial


Back in the Material editor you can adjust the settings of your Vray Light material. Play with the colorand multiplier to get the desired results.

Basic VRAY Tutorial


Aslo you can use a standard MAX material with self illumination to produce geometric lights. SeeExample below.

The curving tube has a rainbow bitmap in the map slot under self illumination. The material is astandard MAX material.

5. Color Bleeding

5.1 Turn off the light "Inside Omni" and turn on the Light "Direct01".

5.2 Under VRay Environment, adjust the GI Environment as we had it before when we made thedirect sunlight renders. Give the multiplier a value of .3 and adjust the color back to a light yellow.

5.3 Select the sphere on the top of the structure and assign the "Yellow1" material to it.

5.4 Render the Scene and you should get a result similar to the image below:

Basic VRAY Tutorial


Roll over the image to see the effects of color bleeding. Light is bouncing off the sphere and ontothe surrounding objects. Though this effect does happen in the real world, I often see it overexaggerated in renderings. You can desaturate your materials (or their corresponding bitmaps) tolessen this effect.

6. VRAY Toon

6.1 From the top menu click Rendering then click environment (Or just press "8") This brings up theEnvironment and Effects Dialog box.

Basic VRAY Tutorial


6.2 Under the Atmosphere rollout click the "Add" button. Select VRay Toon from the list thatappears.

6.3 Scroll down a bit in the Environment and Effects Dialog box to see the VRay Toon settings andchange the line from pixels to world by clicking on the "World" radio button. Give the line thickness aworld value of 6" as shown above.

6.4 Render the scene. You should get a similar result to the image below:

Basic VRAY Tutorial


Note: You can modify the color and thickness of the line to get desired results. Also you can use acustom bitmap in the color slot of the line if you prefer.

7. Interior Lighting

7.1 Switch to Camera02 and make sure the light "Inside Omni" is turned off.

7.2 Press "8" to open the Environment and Effects dialog box. Under the Atmosphere rollout selectVRay Toon from the Effects list. With VRay Toon selected click the delete button. For this exampleof interior lighting we want the VRAY Toon effect turned off.

7.3 Select Pane01, right-click in the viewport and select VRay properties:

Basic VRAY Tutorial


7.4 With the VRAY Properties box open check "Matte object" in the top right. Under Direct Lightcheck shadows. The Matte object makes the plane invisible but it will still render the shadows andreflections. (Useful for studio lighting setups) We did this so that the ground plane wont show up inthe interior render. (Also to explain Vray object properties) There are many useful settings in theVRay object properties box...their labels are self explanitory.

7.5 Render the scene. It should look like the image below:

Basic VRAY Tutorial


It is obviously to dark. As cool as VRAY is, most of the time it needs some help lighting interiorscenes. In other words, a Direct light alone isn't enough. This is where the VRay Lights at thewindows come in. Notice they are positioned right outside of the window (adjust the positioning to fityour specific needs) and are the same shape as the window

7.6 Select VRayLight01 and click the modify tab on the control panel

Basic VRAY Tutorial


7.7 Turn on VRayLight01 by clicking the checkbox under the Parameters rollout. The other fiveVRAY lights in the scene are instances of Light01 and should turn on as well. Make sure "Invisible"is checked. If it isn't, the light from Direct01 won't be able to pass through the VRay Lights.

7.8 With the lights on, render the scene. You should get a result similar to the image below:

Basic VRAY Tutorial


The image looks somewhat grainy with the default VRay Light settings. To correct this we canchange some settings in the VRay QMC Sampler rollout.

7.9 Open the Render Scene dialog box if it isn't open already. (press F10)

7.10 Click the Renderer tab and scroll down to the "VRay QMC Sampler" rollout and expand it if itisn't alread open.

7.11 Adjust you settings to match the image below:

Basic VRAY Tutorial


7.12 Render the scene.

Notice how the adjustments we made reduced the graininess to a more tolerable level. However, therender time has doubled. You'll have to toggle the settings in the QMC Sampler until you reach alevel that optimizes quiality and Speed. This is easier said than done and of course it varies fromscene to scene.

Basic VRAY Tutorial


Comparison of settings. The yellow arrows show the dividing line of the same scene with thedifferent settings.

8. HDRI Lighting

High Dynamic Range Image (HDRI)

The HDRI file used in this tutorial was created by Aversis. Visit www.aversis.be for moretutorials on HDRI lighting and many other VRAY topics.

8.1 Switch to Camera03 and unhide the following objects: Bowl, Glass, Teapot, Torus Knot andWater.

Basic VRAY Tutorial


8.2 Render the scene. You should get something similar to the image below.

The scene is lit only by the light Direct01 and GI bounces.

Basic VRAY Tutorial


8.3 Press "M" to open the Material Editor. Click on theVRay HDRI material in the top right.

Note: To load a VRay HDRI file select an empty material slot and click the blue "Get Material"button which is highlighted in yellow above. When the Material/Map Browser opens, selectVRayHDRI from the list...highlighted in yellow below.

Basic VRAY Tutorial


8.4 Drag the HDRI material from the material editor into both environment slots located in the VRayEnvironment rollout of the render scene dialog box.

Basic VRAY Tutorial


Choose instance when promted and click ok.

8.5 Before we render the scene we need to turn off the light Direct01 and make sure that the GIEnvironment multiplier is set to 1 (highlighted in yellow above) . Since the only thing lighting thescene will be the HDRI light, the GI Environment multiplier needs to be higher. Note: You can, forexample, use a direct light (sunlight) in conjunction with HDRI lighting. But, its a good idea to haveone more powerful than the other to avoid burnt out images (see section 2) Make sure your HDRIparameters are the same as the image above. (play with the settings later)

8.6 Render the scene. Your results should be similar to the image below.

The shadows are much softer and undefined. The look is similar to straight environment lightingdescribed in section 2. However, there are subtle differences. Don't think that HDRI lighting onlyproduces soft shadows. If many cases it does, but that's because the majority of shadows in the realworld have soft edges and HDRI intends to accurately recreate real world lighting conditions.

Basic VRAY Tutorial


Note: HDRI file was created by Aversis. Visit www.aversis.be/extra_hdri/00.htm to downloadmore of his HDRI files and browse his VRAY tutorials.

This is what the HDRI file we are using looks like. This is the image that is lighting our scene. Thesoft shadows in the scene are produced because of the Real World soft shadows captured in theHDRI file.

9. Material Settings

Basic VRAY Tutorial


9.1 Give the Green, Red and Yellow1 materials a light grey color in the reflection slot. You can copythe color by right clicking the color and pasting it into the reflection slots of the other materials. Seeimage below.

Basic VRAY Tutorial


9.2 Render the scene. Your results should be similar to the image above.

Settings for the glass:

Basic VRAY Tutorial


Settings for the water:

Basic VRAY Tutorial


Basic VRAY Tutorial


Note: I used the turbulance noise preset but use what you think will work best for your situation. Youcan animate the bump amount to create a ripple effect in animations.

9.3 Glossy Reflections

Change the settings for the red, green and yellow materials to match the following. (Leave thediffuse colors alone)

Results should be similar to the image below:

Basic VRAY Tutorial


Frosted Glass:

Basic VRAY Tutorial


Basic VRAY Tutorial


The refraction glossies has been lowered to.95. I find this to be a little counter intuitive, but toincrease glossieness you have to lower the spinner.

Note the increase in render time. For animations you might want to find another way to achieve thiseffect. Remember we are still using Basic render settings. Our custom Irradiance Map (IRMap) is setup for quick rendering. Higher quality IR maps will and higher output resolutionswill significantly increase render times. That being said I have managed to render animationswith moving objects using these "low" custom IR map settings without any noticable "flickering"The flickering problem....well thats a whole other tutorial in itself.

10. VRAY Displacement

No steps to follow here just some examples and settings.

A plane with a VRay Displacement map applied to it

Here is the plane without the VRay displacement Map

Basic VRAY Tutorial


Plane with displacement

This is the Map :

Basic VRAY Tutorial


And the displacement map:

Basic VRAY Tutorial


Remember that the white areas get extrude the most and the black areas extruded the least. Keepthat in mind otherwise you may get unwanted results. I spent some time in Photoshop makingcertian ares pure white or pure black in order to aviod "spikes" in the displaced geometry.

To Apply:

1. Select the object you want to apply the VRay Displacement to.

2. Apply a Mesh Smooth Modifer to the object and set the iterations to zero.

Basic VRAY Tutorial


3. Apply a VRay Displacement modifier.

Basic VRAY Tutorial


4. Adjust the settings to match the image below:

In the common params, highlighted in yellow, there is a button to add a bitmap for displacement.This is where I added the black and white stone image seen above.

Basic VRAY Tutorial


basic vray tutorial

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