3dmax and VRay lighting

Recently, I am doing light source layout and rendering for the model, using the traditional max light source, in the case of multiple light sources, due to lack of experience, it is difficult to adjust to a better effect, so I learned the vray light source. The content of the tutorial is organized as follows. The original address is: http://www.3dmax8.com/3dmax/xuanran/9/

max light

Mainly divided into two categories: -
Standard lights
1. Target spotlights Car lights , flashlights
2. Free spotlights
3. Target parallel lights .Sky Light Simulate the sky light in the real world, generally use vray 7. mr area floodlight needs to cooperate with mental ray renderer 8. mr area spotlight

• Photometric Lights
  Target Lights
  Free Lights

vray lighting

Four light sources:
1. VR lighting
2. VRayIES lighting
3. VR sun
4. VR ambient lighting

Category:
Artificial Light Source: VR Lighting, VRayIES Lighting
Natural Light Source: VR Sun, VR Ambient Light

VR lighting

General parameters
Exclude: can exclude objects that do not need to be illuminated
Type : plane, dome, sphere, mesh
Enable viewport shading: display the lighting effect of the light in the view window in real time
Target : add a separate target object for the
light Target distance: specify the light source Distance to target object
Viewport wireframe color: The color of the light's wireframe

Intensity unit: same as the
real world The effect of volume on lighting. 3. Brightness: The brightness of the light is related to the size of the light volume. The larger the light volume, the greater the brightness. The influence of the light volume on the shadow of the object is considered, regardless of the scene size. 4. Radiation: The lighting unit will be defined by wattage. The brightness of the light has nothing to do with the volume of the light, considering the effect of the scene size and the volume of the light on the shadow lighting of the object. 5. Radiant brightness: the same as the brightness except for the unit.

size
light size

Option
1. Transmitted shadows

2. Double-sided, only one side has light if unchecked

3. Invisible: whether the light is visible in the rendering
4. No attenuation: no attenuation

5. Affect diffuse reflection: the diffuse reflection effect of the object material is not Will be

rendered

Sampling
Subdivision: The larger the value, the smoother and more accurate the soft shadow will be, and the time will increase

Shadow Offset: Change the shadow position without changing the direction of the light
Termination: If the value is greater than this value, the lighting of the scene objects will be interrupted

Matrix Lighting Options
Orientation: When the parameter is 0, the light radiates in the direction of 180 degrees, and when it is 1, it is emitted on the horizontal plane

Texture
Resolution: The higher the value, the clearer it is, producing a projector-like effect

Dome
light The direction of the dome light is meaningful, but the position is meaningless

Mesh light
Convert the model to vray light to meet the requirements of lights of different shapes
Pick mesh: pick the model object as light
Reverse normal: judge the lighting direction according to the direction of
the normal Replace mesh with light: check When the mesh is small, the scene has only lights
Extract meshes: duplicate meshes on lights

vray-ies lights

Features : On the basis of point light sources, the optical domain network is used to distribute a wide range and direction of propagation, simulating real lighting effects such as spotlights, downlights, and desk lamps in life.
IES file: Load an ies file.
Rotate XYZ: Rotate the direction of the light.
Overlay graphics: Let the ies light have shape and volume.

vray sun

The vray sun simulates the lighting effect of the sun on the earth in real life, producing different color and brightness changes as the angle changes.

Invisible: Whether the sun is visible when rendered
Affect Diffuse: Whether to render the diffuse reflection of the object's material Affect Specular: Whether to render
the highlight of the object's material
Cast Atmospheric Shadows: When enabled, atmospheric effects in the scene will cast shadows
Turbidity: Indicates the amount of dust in the air, affects the color of the sky and the sun

Ozone : affects the color of the light source

Intensity Multiplier: The intensity parameter of the sun

Size Multiplier: The size of the sun

Filter Color: Adjust the color, which is equivalent to adding a transparent plastic sheet to the sun
Color Mode: Layer Overlay Mode
Shadow Subdivision: The higher the subdivision value, the higher the quality of the

shadow transition. Shadow Offset: Only change the position of the shadow without changing the position of the sun

vray ambient light

Features: produce uniform lighting effects on all objects in the scene, the lamp has no volume attenuation and does not consider the occlusion of objects
Mode : 1. Affects direct and indirect lighting; 2. Affects direct lighting; 3. Affects
the minimum distance of indirect lighting GI (indirect lighting) : Two objects smaller than this value will not calculate indirect lighting between the two objects

Color : The color of the ambient light
Intensity:
Intensity Lightmaps: In the mode that affects only direct lighting, check Lightmaps and load a gradient Texture
Exposure Compensation: Make sure the color of the ambient light is not affected by the exposure settings of the physical camera

Summary: In indirect lighting, you can use the celestial ambient light for auxiliary lighting to increase the brightness of the indirect lighting

the difference

1. maxLights have no volume, vraylights have volume

   maxThe light needs to open the shadow and set the parameters of the shadow map (advanced effects, shadow parameters, shadow map parameters, etc.) to have an effect. The sampling density determines the brightness of the shadow, and the sampling range determines the degree of soft shadow.
   The effects of volume are as follows:
   

2. vrayThe attenuation of the light is automatic, and maxthe attenuation of the light requires manual conditions. The types are: 1. No attenuation, 2. Inverse inverse, 3. Inverse square inverse square