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Questions tagged [reflection]

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4 votes
0 answers
567 views

Normal mapping for planar reflections

Ok guys, tricky one! I'm trying to modify this Unity script + shader to include normal mapping. The tl;dr is, it uses a single texture rather than a cubemap as it is only for reflecting in a planar ...
russ's user avatar
  • 2,402
3 votes
0 answers
117 views

How can i achieve reflections like this?

I was in my elevator when i saw this... As you can see here that reflections are kind of stretched. What causes this? And how can we achieve something like this in computer graphics?
videogamechef's user avatar
2 votes
0 answers
66 views

Fresnel and light reflection/refraction

I keep reading about fresnel and there is one thing I don't fully understand. My understanding : Here is my understanding so far, so please correct me where I am wrong. Fresnel is related to ior (eta)...
LeXav's user avatar
  • 23
2 votes
0 answers
592 views

Calculating intensities of Virtual Point Lights in Instant Radiosity from IES lights

Short introduction I created a function that interpolates the IES luminious intensities (candelas) using Hermite interpolation, so in my code all light sources have $I(\theta, \phi)$ function - but ...
George Wilson's user avatar
1 vote
0 answers
50 views

BlinnPhong sphere edges look worse than Phong. Am I doing it wrong? (code and pictures included)

First of all, I am completely new to this so please excuse me if this is a dumb question. I am following the book Real-Time 3D Rendering with DirectX and HLSL, for now implementing shaders in Nvidia ...
egil87's user avatar
  • 11
1 vote
0 answers
213 views

Normal mapping should affect specular reflections?

I'm asking this question on behalf of a friend so can't provide any images for now. The problem is to simulate a car paint material with some flakes or graininess in it. This is first done in blender ...
gallickgunner's user avatar
1 vote
0 answers
58 views

Why Screen Space effects flicker?

Nowadays is less of an issue, i think SS got massaged a little bit, but you can still spot it. These happen with SS Reflections, SSAO and Bloom. When you move the camera, the effect starts to flciker ...
Matheus Lacerda Bezerra's user avatar
1 vote
0 answers
211 views

Pathtracing specular reflections vs. specular highlights

In path-tracing, is a specular reflection model like Blinn-Phong useful? Is it more accurate to render a complete reflection dependent on the objects roughness?
Orange Mushroom's user avatar
0 votes
0 answers
46 views

Understanding the BRDF Equation

I am studying the BRDF equation. From Wikipedia, the equation is as follows: I have one main question: Where does the $\cos{\theta_i}$ in the denominator come from? The denominator implies that $...
Christopher Miller's user avatar
0 votes
1 answer
116 views

How to pick values of ambient, diffuse, specular for Phong Lighting?

I have the following code in python using the vedo package ...
Probability_Sarah's user avatar
0 votes
0 answers
2k views

Color shading and light calculation for ray tracing

I am currently building a ray tracer and I came across a problem and confusion regarding the light calculations. For lighting, I am using the following mathematical model: Where ...
Abdullah Emad's user avatar
0 votes
0 answers
527 views

What is a good way to do reflection and refraction in small environment for bumpy planar surface?

I am implementing a water simulation program using OpenGL. However I could not decide which technique to use for reflection and refraction. The water is wavy and there are dynamic objects around the ...
user3117189's user avatar