Vray Lights English

Vray Lights Hello Guys! My name is Victor Phellipe and this is my second tutorial. The first one is “How to Install Vray on Linux (Brazilian Portuguese)”. And now I'll speak more about the lights in Vray. In this tutorial, I'm using the 1.60.16 Version of Vray (demo), the 2.8 version of Blender and the 0.9.9 version of the Vray/Blender script. The lamps of Blender, in Vray language, are said otherwise. This is the list of names of lamps: Blender Lamp

Vray VrayLight Sphere

Spot

VraySpotLight, VrayLight IES

Area

VrayLight Rectangle

Sun

VrayDirectLight, VraySun

Lamp Radius: Increase the range of the light and control the diffusion shadow capacity. Subdivs: Controls the shadow quality. Invisible: With the Invisible Button activated, the source light will not appear in the render. Store: This option works together with Irradiance Map. Enabling this option, the calculation of IM (Irradiance Map) will be more slowly, but in compensation, the render will be faster. Units: This option choose the unit used in the intensity of light. Intensity: Value refered for the light Intensity. An important point to be highlighted is: Increasing the Radius of the lamp, the intensity will increase also, because it has more surface contact. So, we must to reduce the intensity of the light for regular. In Max, there is a parameter that automatically regulates and works very well! His name is Normalize Intensity.

Irradiance Map: 6s - Rendering: 36,3s – Store: Off

Irradiance Map: 6,2s - Rendering: 45,8s – Store: On

Settings of the two renders: ● Radius: 0.03 ● Intensity: 8000 ● Subdivision: 100 ● Units: Default At the first render, the Store isn't enabled. According to theory, the render time (Rendering) should be more fast, but it was slower! Maybe is my scene. For more information, visit: http://www.spot3d.com/vray/help/150SP1/examples_lights.htm#ex2

Irradiance Map: 7,4s - Rendering: 56,6s

Irradiance Map: 9,3s - Rendering: 1m e 4,1s

At the first render, the Store option isn't enabled. Settings of the two renders: ● Radius: 0.5 ● Intensity: 30 ● Subdivision: 100 ● Units: Default

Look at the first render (Previous page) with the third (First image from left). At the last, we increases in the radius for produce soft shadows and had to decreases the Intensity. So, for the same effects in render, Radius and Intensity are inversely proportional, that is, if I increases in one value I have to decrease the other. Spot IES: Only this kind of lamp can produce IES lights. Activating this option, two more options they will appear: Soft Shadow and File. Soft Shadow: Let the shade softer. File: This box loads the IES file for to be emitted by the lamp. Subdivs: Control the quality of the shadow. The same happens at all kind of lamps. Invisible: With the Invisible button enabled, the source light will not appear in the render. Units: This option choose the unit used in the intensity of light. Intensity: Value refered for the light Intensity. IES light can't be regulated, so if your light is too weak, reduce the size of your scene and render it again. Area Skylight Portal: This option automates the Vraylight, because she takes all the necessary information from the Sky (World) or what is behind him. All options follow the same function in all Lamps. Without exceptions. This light is the most important one, together with the Sun, because she simulate the light coming from a Window, making a very soft shadow.

Sun

Sun: Automates the Sun, letting his configuration for the side bar, Physical Sky/Sun. We'll talk about him pretty soon. Beam radius: It's the range area of the Sun. Equals the parameter Spot Size, of the Spot lamp. Shadow radius: How much bigger is the value, more blurry is the shadow of the Light Sun. Subdivs: Control the shadow quality. Invisible: Let the light source invisible for render. Store: This option works together with Irradiance Map. Enabling this option, the calculation of IM (Irradiance Map) will be more slowly, but in compensation, the render will be faster. Units: This option choose the unit used in the intensity of light. Intensity: Value refered for the light Intensity. Here we can see the diference in VraySun and VrayDirectLight. VraySun is when we enabled the “Sun” option and the VrayDirectLight is the inverse. I prefer to use a VraySun, because with her we have a few options turned to our advantage in that it helps to increase the realism. Look at this renders:

VraySun

VrayDirectLight

I know... The scene is very simple. It's Because I use this scene for material testings... At the first render, with VraySun, she takes in consider: The angle formed betwen the plane, or the horizontal (11º), the atmosphere (Turbidity) and the color of the light (Ozone). VrayDirectLight doesn't consider none of this options. Physical Sun/Sky Turbidity: That value changes the environment color and the color of the Sun. Small values leave the atmosphere clear and clean and bigger values makes the Sky more orange, light feature at dusk. Ozone: Altera na cor da Luz solar. Quanto maior for o valor, mais azul será a sua Sun. Changes in the color of the Sun. How much bigger is the value, bluer will be the Sun. Intensity: It is the intensity of sunlight. By default, it is too high, then it needs to reduce the value to achieve a good result. Size: Let the shadow blurry and increases the size of the radius of the sun. It seems with the option Radius, the VrayLight Sphere, but do not have to reduce its intensity to achieve the same result. Shadow Subdivs: Control the shadow quality.

Shadow Bias: Move the shadow toward or away from the object. If the value is low, the shade "through" places where they should not. If high, the shade tends to go away from the object, which means it off. Photon Radius: Here we can define the area where the photons will be shoot. This value is linked directly to photons, which are linked directly to the caustic and the method of GI: Photon. Sky Intensity: Determines the intensity of the Sky. Down this value to 0, we "off" the sky, leaving it black. Turbidity: Intensity: 1, Subdivs: 3, Size: 1.0

Turbidity: 2

Turbidity: 4

Ozone: Turbidity: 2.2, Subdivs 36, Intensity: 1, Size: 10.0

Ozone: 0.0

Ozone: 1.0

Size:

Turbidity: 3.0, Subdivs: 8, Intensity: 1

Size: 1

Size: 10

For more examples, see: http://www.spot3d.com/vray/help/150SP1/examples_vraysun_sky.htm

Links http://blender.bevice.net.ru/ - Website of the script Vray/Blender http://www.spot3d.com/vray/help/150SP1/index.htm - Vray help files

About me:

www.victorphellipe.wordpress.com

Name: Victor Phellipe Age: 15 Years old Location: Brasilia, Brazil Language: English, Portuguese. Ocupation: Student Programs: GIMP, Photoshop, Blender, Vray, Yaf(a)Ray, Indigo. More about me: I am attending the 1st year of High school and what I most like to do is 3D! I really love it and I wanna to live thereform, even if it is early for thinking! I would like to get some training in 3D area, but I think I will train even in computer science ... So, this is me! Or just a little...