How do you calculate specular lighting?
The specular component is calculated by taking the dot product of the reflection vector and the view direction, raised to the power given by the SpecularPower variable making the highlight harder or softer. The result is multiplied by SpecularIntensity to make the highlight brighter or darker.
What is the correct equation of specular reflection?
Which is the correct equation of specular reflection? Identify the correct band of visible light….21.
| (a) | Material properties of the surface |
|---|---|
| (c) | Specular reflection coefficient |
| (d) | All of these |
How do you calculate Phong?
Phong gave spectral reflectivity as: diffuse + Ks * (R dot V)^n Which is: Kd * (N dot L) + Ks * (R dot V)^n Where Kd is the diffuse component and Ks is the specular compoenet. This is the generally accepted phong lighting equation.
What is a specular exponent?
The exponent is typically called the “shininess” exponent. The larger the exponent, the more shiny an object appears. Shiny objects have small, focused specular reflection. Dull objects have large, spread out specular reflection.
How do you calculate diffuse color?
If the angle is greater than zero we calculate the diffuse color by multiplying the basic light color by the constant diffuse intensity and then scaling the result by the diffuse factor. If the angle between the light and the normal is 0 the diffuse factor will be 1 which will provide the maximum light strength.
What is specular intensity?
Intensity. The intensity, or brightness of the specular highlight. This has a range of [0-1]. Ramp. Allows you to set a range of specular colors for Material, and define how the range will vary over a surface.
What is specular reflection of light?
Specular reflection is a type of surface reflectance often described as a mirror-like reflection of light from the surface. In specular reflection, the incident light is reflected into a single outgoing direction.
What is specular texture?
A specular surface is a highly smooth surface. When the surface is very smooth, the reflected highlight is easy to see. As the surface becomes rougher, the reflected highlights gets broader and dimmer. This is a more “diffused” reflection.
How do you calculate diffuse lighting?
What is the difference between Gouraud and Phong shading?
Gouraud shading (AKA Smooth Shading) is a per-vertex color computation. In contrast, Phong shading is a per-fragment color computation. The vertex shader provides the normal and position data as out variables to the fragment shader.
How do you calculate diffuse light?
How do you find the light vector?
Light Vector Calculation for Per Pixel Diffuse lighting
- Set World Light Position.
- Subtract the current vertex’s postion from world Light position.
- Multiply the reultant with the TBN Matrix to get the light vector in tangent space basis.
How is the scattering of specular light calculated?
The scattering is centered around the reflection vector as shown in the diagram to the left. Specular light intensity. If we calculate a vector from a fragment to the camera, and then calculate the angle between it and the reflection vector, we can use the angle to estimate the amount of specular reflection the camera receives.
What do you mean by Specular reflection in lighting?
A light ray that reflects off of a surface at an equal but opposite angle to its incoming angle is called “specular reflection.” We assume that the amount of light reflection is equal to the intensity of the incoming light. That is, we assume that the magnitude of the reflection vector is equal to the magnitude of the incoming light vector.
How is specular reflection measured in a spectrophotometer?
Measurement of specular reflection is performed with normal or varying incidence reflection spectrophotometers ( reflectometer) using a scanning variable-wavelength light source. Lower quality measurements using a glossmeter quantify the glossy appearance of a surface in gloss units .
How is the color of a specular highlight determined?
On metallic materials such as gold the color of the specular highlight will reflect the color of the material. A number of different models exist to predict the distribution of microfacets. Most assume that the microfacet normals are distributed evenly around the normal; these models are called isotropic.