studio lighting with v

8/9/2019 Studio Lighting With V

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Studio Lighting with V-ray by Géza Kádas

OVERVIEW

In this tutorial i will tell you the method of studio lighting. For the rendering i used Vray 1.5rc3, the latesmodeled in 3ds max 9. With the knowledge of this tutorial you will be able to present your models in a m

The main parts of the tutorial are :

-Making the environment-Placing the lights

-Setting up Vray for tests-Shaders

-Setting up Vray for final rendering



-Postwork in Photoshop

MAKING THE ENVIRONMENT

The environment is pretty much simple. Place a plane under the model and set 3 for the Length segsment

click on the plane and choosing "convert to:".

The next step is selecting the two edges behind the chair and pull them up while pressing the shift button



We will use a Turbosmooth modofier on the plane, but to controll the way of smoothingwe have to chamfer a few edges before.



Now we are able to use the turbosmooth with 2 Iterations.

PLACING THE LIGHTS

This topic is the heart of the studio lighting. We will use 3 vraylights with different strength,postion and

youre render. So place a vraylight from left view, with the given settings.



Now change to top view ,copy the light and mirror it to the X axle. Place it to the right side of the plane arenderings.



Create a Target Camera from top view with 35mm lens, and set it up as you see.



All right,choose vray as your primary renderer. Make a vray material with a light grey diffuse color, R:1Switches tab.

Now all the objects in the scene will have this material, so this function is great to test lighting with a clagot here.



So this is what we have without any settings. No illumination,or any kind of sampling except the standarthe next topic.

SETTING UP VRAY FOR TESTS

To test the illumination in the scene we need to set up vray with low values. These are only tests ,so we oaspect ratio to 1.8 in the Common tab. Go to camera view and turn on the "Safe Frame" option.

Safe Frame will help you to place youre camera to the right position and it

is also helps to notice unwanted parts in the view.



Now here comes the capital part of the Renderer tab settings.



Here is a short explanation of the settings above:

Default lights: turn it off ,we do not want any light, except the vray ones.Adaptive QMC: A faster image sampling method than Adaptive subdivision.

Mitchell-Netravali: With this antialiasing filter edges will be sharp but not crisp.Irradiance map + Light cache: the mostly used GI combination.

HSph subdiv: (GI samples) lower it to speed up the rendering process.Show calc phase: The rendering process will be visualized, so if are not happy with

the effect you don't have to wait until the effective rendering.Subdivision: The subdiv. of lightcache controls the number of traced paths...

The actual number of the traced paths is the square of the adjusted number.So with 500subdiv. 250.000 paths will be traced.

Exponential: With this type of colormapping ,colors will be saturated so you canavoid burnouts on the surfaces.

Dark multiplier: This controls the "Sternth" or the multiplier of dark colors.Render region division: set it to 32x32 ,smaller bucket size less ram will needed.

with samller bucket size a faster feedback can be achieved.

All right, lets see the render with the mentioned settings.

It is much better than the first one.

The scene is much more brighter, light is smoother and there are no burnouts.Because of the low quality settings there are GI artifacts ,noise and blurry lines.

However ,these settings provide us a very efficent way of testing.



Lets play with the colors to break the dull feeling of the render.

Change the color of the vray light on the right to R:255/G:180/B:80.This warm orange color will take care of the monotonic lighting.

At this point if you are satisfied with the result you can go to the next step.

Creating and understanding shaders is the following topic.

SHADERS

In this scene i used four or five shaders. Plasctic,Chrome,Leather,White fabric, and the white background

Lets take a quick look at the settings.



Diffuse: This controls the color of the material.Reflect: Pure white means 100%reflections ,black means 0% reflections.Refl. Glossiness: Controls the blurryness of reflection 1 means perfect

mirror-like reflections, lower values produce blurry reflections.Subdivision: This controls the quality of glossy reflections, higher values

increase rendertime lower values produce noisy effect.For testing /5-8/ final rendering /15-35 or higher if necesarry/.

Freshnel reflections: If you check it that means the strength of the reflection willdepend on the viewing angle of the surface.

In nature water and glass is reflecting in this manner.The strength of the reflection depends on the Freshnel IOR too.

All right lets see the shaders in action...:)



I am pretty happy with the reflections on the leather material.

I only need a little more light from above the chair, so lets put that thirdvraylight to its place.



It is important to uncheck the "Affect Specular" slot, we don't want any

specular reflection from that light ,only diffuse light.



As we can see the bounced light reaches to the bottom of the chair too.

Now the lighting and the shaders are finished so lets move on to the next topic.I will discuss the settings of the final rendering.

SETTING UP VRAY FOR FINAL RENDERING

At this ponit of the workflow it is very important to find the balance between speed and quality.

I will talk about the settings globaly, because some problems can't be solvedwith only changing the value of an option.

So lets see the Renderer tab in this light:)



-Change the resoultion to 900x500-Set the Adaptive rQMC image samplers min dubdiv to 2.



Now thinner lines can be rendered correctly.

-Change the preset of the Irradiance map to Medium from Low.Set 50 to the HSph subdiv to achive higher quality GI.

-Use value 1200 for the Light cache subdiv.Change the Sample size to 0,006 ,now small details will be more visible.

Use value 1000 to the Pre-filter option to reduce noise.We have a lot of glossi rays so check the "Use light cache for glossi rays"

option./it will speed up rendering/For the Filter use the "None" possibility.

-At the rQMC sampler use value 0,005 for noise treshold.Set the Global subdivs multiplier to 4 ,it will increase samling quality

everywhere in the scene.-You can find the Light properties in System>Lights settings.

Changing the diffuse subdivision of the lights wil effect the number of the traced photons.

-Change all the vraylights subdivison to 15 or 20 to avoid noisy parts.

-Change all the materials subdivs to 20 in the Reflection section.With these settings the rendertime will increase a lot according to test render settings. Now hit F9 and wait until the calculation finishes.



This is the final rendering, no noise ,artifacts or any nerve-rackingrendering trouble.

A picture would not be complete without the postwork so lets move on.

POSTWORK

Launch photoshop, and load in the image.Because of the saturated colors of the exponential colormapping type.

We need to add more character to the colors and play with the levels

to achieve better contrast.

Go to Image>Adjustments>Color balance



Than Image>Adjustments>Levels



And here comes the finished picture.



Congratulations ! you finished the tutorial...I hope you liked it. ;)

studio lighting with v

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