The simulation of light and illumination in games, including its interaction with the environment. A core element of games that can bring out vivacity into otherwise static worlds.

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2
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2answers
749 views

Light levels - How to determine if a character should be spotted

Our team is trying to develop a stealth system with the UDK. Part of this will involve lighting. The idea being that if you're hiding in a dark corner of the room, the armed goons will not start ...
2
votes
2answers
209 views

Where should shaders and lights be in a component-based entity system?

Where should I put the shader and the light / shadow calculation? Should that be a component too? And should the rendering system know how to handle them or should there be a separate light system? ...
2
votes
1answer
508 views

Multiply mode in SpriteBatch

I have a "lighting" texture (black background with white or colours for lights) that I want to draw as a multiplcation operation. SpriteBatch.Begin can specify BlendState.Additive, but there's no ...
2
votes
1answer
370 views

Does the standard lighting equation ever allow objects to be brighter than their textures?

It occurred to me that the standard lighting setup you see in all the tutorials doesn't allow lights to actually make an object appear brighter than its texture. The light value is always clamped ...
2
votes
2answers
2k views

2D Real-Time shadows on level on a level made from a Dynamic Bitmap

The Bitmap has transparency, and only non-transparent pixels are solid and used for hit detection for the physics engine and gameplay. I have seen some versions done with convex hulls, but for ...
2
votes
1answer
373 views

Compute Shader Memory Sharing

Ok guys I have had some pretty good success on this site but I feel that this is a pretty complex question. I am trying to do tile based deferred lighting using DirectX 11 and the compute shader. ...
2
votes
1answer
442 views

How to solve artifacts caused by vertex lighting in my voxel engine?

My current lighting system bakes the light amount based on ray-tracing from the light source to the 8 corners of the block (so per-vertex) and the distance to the light on the blocks. It works ...
2
votes
1answer
707 views

Radiosity lightmap generation

Is there any working C++ source code for a lightmap generation algorithm using Radiosity or any other GI system? I've found technical papers only, but I can't really find any implementation.
2
votes
1answer
236 views

Deferred rendering with both Clockwise and CounterClockwise culling

I have a deferred rendering system that works well with objects that appear solid and drawn using CounterClockwise culling. I have a problem with Clockwise culled objects that are supposed to ...
2
votes
2answers
125 views

Render with multiple lights (one pass per light)

I have already a system that at the moment handle multiple lights just passing an array of light struct and loop through it. I had been told to switch to a multipass rendering approach. How should I ...
2
votes
2answers
31 views

Derive direction in which a spot light emites its light from a projection matrix

First of all, sorry if my question sounds too basic or even makes no sense. I'm new with game development I'm working with HPL1Engine, specifically, the lights parts. I need to know the direction in ...
2
votes
2answers
287 views

How can I calculate spotlight lighting in Vertex/Fragment shader in Unity?

I've written a vertex/fragment shader for my game. It uses 3 textures and represents a floating water on the wall (so I have 1 texture for water, 1 for geometry and the last one is mask) so it looks ...
2
votes
2answers
520 views

Shadow mapping with directional light?

I'm doing shadow mapping in my OpenGL 4.3 deferred renderer, and I'm starting with directional lights believing it to be the easiest. What I do not understand is how the view projection matrix is to ...
2
votes
1answer
176 views

Are ambient, diffuse and specular light or material properties?

Are ambient, diffuse and specular properties of light or material? I am doing ray casting in OpenGL, I've managed to create lit sphere using formula I = L Ka + L Kd (n . l) + L Ks (r . v)^n but I ...
2
votes
1answer
441 views

Shadow mapping with deffered shading for directional lights - shadow map projection problem

I'm trying to implement shadow mapping to my engine. I started with directional lights because they seemed to be the easiest one, but I was wrong :) I have implemented deferred shading and I retrieve ...
2
votes
2answers
154 views

.md5mesh normals are not smooth

I'm currently working on a project that requires me to load .md5mesh format and draw it. Following this link I've managed to load the mesh into the engine successfully, but a problem arises when ...
2
votes
1answer
491 views

How to do directional per fragment lighting in world space?

I am attempting to create a GLSL shader for simple, per-fragment directional light. So far, after following many tutorials, I have continually ran into the issue: my light is specified in world ...
2
votes
1answer
326 views

Unity3D custom camera matrix breaking shadows/lights in deferred rendering

EDIT 1: So it seems this is a common issue with Unity, and it comes from a bug in which custom camera matrices break deferred lighting and shadows. This topic right here talks about it a bit, but the ...
2
votes
1answer
698 views

2D Point Light XNA , Why my point light radius is Oval?

I friend of mine , taught me how to make a simple 2d point light with shader, so i follow his steps and finally done it ! but something happend , the light shape is like an oval and not like a ...
2
votes
3answers
210 views

Does radiosity work with skylight?

Does radiosity work with skylight (directional light)? From reading online it sounds like it was intended to work with point lights but I would really like to make it work with skylight if possible. ...
2
votes
1answer
114 views

Irradiance cubemap to spherical harmonics conversion

What are advantages of using spherical harmonics instead of irradiance cubemap? Are there any common used methods for conversion?
2
votes
1answer
192 views

Surface shader with VertexLit causes black object

I wrote the simplest possible surface shader: Shader "SimpleSurf" { Properties { _MainTex ("Base (RGB)", 2D) = "white" {} } SubShader { Tags {"RenderType"="Opaque" } ...
2
votes
2answers
315 views

How can I support many point light sources in a dynamically-generated level in Unity?

I'm currently working with a dungeon game which is similar to Dungeon Keeper by Mythic Entertainment. I'm using Unity and developing this game for Ipad 2 and above. Player can modify his dungeon, and ...
2
votes
1answer
132 views

2D lighting causes black rings to appear

A year ago I implemented 2d lighting in XNA using sprites. The sprites I used were created by placing a soft white photoshop brush on a transparant background. The result was this: (lights only) ...
2
votes
1answer
141 views

Fragments never falling into spot light's cone

I am using GLSL version 1.20 with OpenGL 2.1 . I am trying to compute when a fragment falls into the area of a spot light. I have already set all the light values with glLightfv and glLightf, also ...
2
votes
1answer
822 views

Light mask map and camera for static lights in XNA Platformer

Using the example for some basic light maps found here : http://blog.josack.com/2011/07/xna-2d-dynamic-lighting.html, I've managed to create a lightmap texture using individual lightmaps and display ...
2
votes
1answer
956 views

How do I get light to go through a window texture in Unity?

I'm having trouble with the lighting (I have windows and the light wont go through). How do I get the light to proceed through the glass?
2
votes
0answers
41 views

Compute directional light frustum from view furstum points and light direction

I'm working on a friends engine project and my task is to construct a new frustum from the light direction that overlaps the view frustum and possible shadow casters. The project already has a ...
2
votes
0answers
85 views

How to implement simple shadows on XNA?

UPDATE: See photos below the description I try desperately to implement shadows on my XNA games. My game is a style of games like Voxel (minecraft). The problem is that I do not find support / ...
2
votes
0answers
250 views

Libgdx - IsometricTiledMapRenderer and light shading

I am wondering if there is any way to simulate light shading in Libgdx using an IsometricTiledMapRenderer. Here is my code to draw an isometric map, it's able to be moved around with the mouse and ...
2
votes
1answer
230 views

Incorrect lighting results with deferred rendering

I am trying to render a light-pass to a texture which I will later apply on the scene. But I seem to calculate the light position wrong. I am working on view-space. In the image above, I am ...
2
votes
0answers
245 views

Monogame working with Krypton

I am trying to make a simple 2D game engine using Monogame and the Krypton 2.0 lighting engine. So far I have succeeded in rendering a light but I am unable to generate any shadows from any hull's. ...
2
votes
0answers
571 views

How to occlude lights in Unity3D?

First off, I own Unity Pro. I've been looking in to occluding lights when they aren't being viewed for a while now to improve performance. The main methods I ran in to were using BecameVisible() and ...
2
votes
0answers
318 views

Per fragment lighting with OpenGL 4.x tessellated model

I'm experienced with OpenGL 3+. I'm dabbling with tessellation shaders and have now got to a point where I have a nicely tessellated teapot/plane demo (quick look here) As can be seen from the ...
2
votes
0answers
835 views

How can I use the dualforward parameter in my unity shader to use lightmaps and normal maps together? [closed]

I'm using the free version of unity and I would like to combine lightmaps with specularity and normal maps. After doing a -bunch- of research, I've figured out that there doesn't seem to be any easy ...
2
votes
1answer
801 views

Has anyone got the Krypton Lighting Engine working in MonoGame for Windows 8?

I've converted the core of the Krypton Lighting Engine so that it's compatible with Windows 8. The trouble I'm having when actually using it is that it can't load the KryptonEffect.xnb file. I'm ...
1
vote
2answers
626 views

How does Minecraft compute lighting for it's non-block objects?

I was wondering how the creator of Minecraft went about lighting the objects (player and pickaxe) based on the lighting level around the player. I have implemented the ability to light the blocks ...
1
vote
2answers
212 views

Diffuse light direction

I'm learning a tutorial from Rastertek about diffuse light with DX 11, here's the shader code: float4 LightPixelShader(PixelInputType input) : SV_TARGET { float4 textureColor; float3 ...
1
vote
1answer
110 views

Shouldn't fragment lighting have the same effect as vertex lighting with only ambient and diffuse lights?

With infinite light source and only ambient and diffuse lights — no specular light, it seems the rendering results of vertex lighting and fragment lighting should be the same, because all the lighting ...
1
vote
2answers
174 views

Can global Illumination via path tracing replace all other current lighting techniques?

In the sense that you currently have algorithms like HDR, shadows, reflections, caustics, motion blur and so on, does complete path tracing take care of all these effects, or would you still have to ...
1
vote
4answers
223 views

Cell Lighting Propagation Problem

I have in place a cell-based lighting system that works basically like this: (Not my actual code) //Light moves up for (int x = 0; x < width; x += 1) { for (int y = 0; y < ...
1
vote
1answer
386 views

How can I calculate a terrain's normals?

Im trying to implement basic lighting in Opengl 3+ (a sun) with this tutorial : http://www.mbsoftworks.sk/index.php?page=tutorials&series=1&tutorial=11 Im building a basic terrain and its ...
1
vote
1answer
120 views

OpenGL light not shining quad

I've constructed a scene using OpenGL/GLUT with a spot light but I'm getting troubles with light shining some of the walls what is going on and how to solve?
1
vote
2answers
708 views

Getting a black scene with XNA, what am I doing wrong?

I'm new to XNA (ver 4) and I'm obviously doing something wrong but I don't know what. So far I have managed to model my scene (quite simple, just a bunch of squares which are calculated--there are no ...
1
vote
2answers
108 views

2D Lighting Glitch

I've been working on a game in Java, and recently I decided to try out my game on a netbook just to see how it would run. While I do get a constant and decent FPS, it appears that my lighting ...
1
vote
2answers
400 views

Voxel Lighting in Unity3D

I'm working on a Voxel project in Unity3D for fun and learning. I've been reading up on how this is done and have implemented a simple Voxel map in my project. My question is about the lighting. I've ...
1
vote
2answers
103 views

pre-rendering light on texture based on bump map

Using a gray-scale bump-map and N sources of colored light, what is the algorithm to render the light on the textured surface, assuming I have the angle(s) and distance of each light source? (I am ...
1
vote
1answer
61 views

Spot lights - making narrow/broad spot lights give more/less intense light

When I use "normal" spot lights as presented in tutorials such as this (with the exception that I use inverse square fall-off and then gamma correction), the spot light doesn't behave like a real ...
1
vote
1answer
180 views

Do any games support different lighting effects according to whether a surface is wet or dry?

I've noticed that when driving at night, when the road surface is dry, my headlights appear to illuminate much further than when the road surface is wet. I presume that this is due to the differences ...
1
vote
2answers
2k views

why specular light is not running?

i'm on JOGL this is my method for lighting: private void lights(GL gl) { float[] LightPos = {0.0f, 0.0f, -1.0f, 1.0f}; float[] LightAmb = {0.2f, 0.2f, 0.2f, 1.0f}; float[] LightDif = ...