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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34 views

2D mask based lighting

I'm kind of concepting a 2D game at the moment and am thinking about dynamic lighting. I plan on having a background layer, and a foreground layer. Objects in the foreground layer will affect ...
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1answer
41 views

XNA Diffuse Shader Issue. Edge lighting problem. Image Attached

As you can see in this image the diffuse shading is working correctly in some places but in other places such as the the bottom of the sphere you can see the squares/triangles of the mesh. Any ...
16
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3answers
3k views

What is the utility of squared radius and inverse squared radius for lighting computations?

On one of the slides from "DirectX 11 Rendering in Battlefield 3" PowerPoint I noticed the folowing code: struct Light { float3 pos; float sqrRadius; float3 color; float invSqrRadius; } I ...
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4answers
213 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 < ...
6
votes
2answers
404 views

Detecting Light Intensity Around Characters

Later Edit Since there seemed to be a bit of confusion: I am asking this for purely didactic reasons, I'm not searching for the most efficient solution. Reformulated question: I'm working under ...
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0answers
41 views

SpotLight in ForwardBase pass using forward rendering

Is there anyway I can force Unity to allow me using a custom shader to render spotlights in a ForwardBase pass (using Forward Rendering Path)? For what I could see since now: Unity use and ...
1
vote
1answer
619 views

how to modify shadow mapping in “3D Graphics with XNA Game Studio 4.0”? [closed]

So I've been following the tutorials from the book Sean James's "3D Graphics with XNA Game Studio 4.0", and have been doing fine until i reached the shadow mapping part. in this book it creates point ...
3
votes
1answer
102 views

Understanding and editing HDR light environments in Photoshop

I'm working with an in-development system that uses .hdr environments (equirectangular projection) to provide image-based lighting (IBL) to a 3D rendering. I'm trying to understand what range of ...
1
vote
1answer
65 views

How to create a sun billboard with Ogre3d

I've been working with a few different engines alongside trying to code my own project. Rather than rewrite an entire renderer, etc I am using Ogre3d. To begin with I am trying to implement a very ...
0
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1answer
49 views

Surface shader ignores lighting in vertexLit path

I want to use a surface shader in VertexLit(not Forward) rendering path. I caused a problem that the compiled shader completely ingnores lighting from the light sources on the scene. Here's the code: ...
1
vote
1answer
32 views

Correcting Lighting in Stencil Reflections

I'm just playing around with OpenGL seeing how different methods of making shadows and reflections work. I've been following this tutorial which describes using GLUT_STENCIL's and MASK's to create a ...
3
votes
0answers
70 views

Creating a black light (ultraviolet) shader?

I am interested in the algorithm for color picking that would ideally allow to choose what color range will be highlighted and what color range will be faded. I can sort-of understand how to make it ...
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0answers
23 views

Cone Lighting formula for 2D projection space?

There is a good formula for a 3d cone lighting: float angleCos = dot(lightVector.rgb, lightDirection.rgb); attenuation = saturate((angleCos-coneCos)*coneCos); What if I want to compute whether my ...
2
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0answers
455 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 ...
3
votes
1answer
357 views

Changing Ogre3D terrain lighting in real time

I'm looking at the Ogre 3D library and I'm browsing through some examples / tutorials. My question is about terrain. There are a few examples showing how great the terrain system is, but I think that ...
1
vote
1answer
82 views

Why is the light following my camera around?

I have implemented a simple Phong shader without specular highlights for now (just ambient + diffuse components) The problem however, is that the calculations seem to be done in camera space; as I ...
0
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2answers
31 views

Compute cone angle (cos) given side and hypotenuse vectors at time 0 and world matrix at time 1

I need a formula for the cosine of a cone, given normalized side vector, normalized hypotenuse vector at time 0 and world matrix at time 1. This is needed to implement custom spotlights in a level ...
0
votes
2answers
384 views

Simple 2d tile based lighting in xna

I am currently trying to implement simple lighting into my game. My world is represented in a 2d array of numbers, each number being a certain tile. I am changing the color parameter in the ...
5
votes
1answer
310 views

Lightmapped prefabs for procedural content

I'm doing a game with procedural content from handmade prefabs, but I ran into a problem as Unity bakes the scene instead of objects when lightmapping with Beast. So when the prefabs are instanced ...
1
vote
1answer
120 views

How do I get my polygons to be lighted by either side?

Okay, I am using Ogre3D and Gorilla(2D library for ogre3D) and I am making Gorilla::Screenrenderables in the open scene. The problem that I am having is that when I make a light and have my ...
0
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0answers
29 views

Checking if a object is blocking my view of a light (it's between light and camera)

I'm trying to determine, from a list of objects, which ones are blocking my view of a light. In other words: which ones are between the light and the camera. Coding in C++, using HPL1Engine. This is ...
6
votes
3answers
2k views

How do I implement occluded lighting in a block-based 2D game?

I want to have 2D lighting that can be blocked by in-game objects. My game has a top-down view and all game objects are described by rectangles. Let's say I have a 10x10 world and I place a light at ...
2
votes
2answers
25 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 ...
0
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0answers
60 views

Cast shadow without rendering object

I'm new to UDK, and am using it to develop a survival-horror game based heavily on shadows. My question is short: is there a way to create an actor that, when rendered, ONLY renders its shadow (not ...
3
votes
1answer
916 views

GLSL Light (Attenuation, Color and intensity) formula

I'm implementing point lights in my Voxel engine, and I'm really struggling to get a good flow of light, from 100% near the light source to 0% at the light radius. I have 5 arguments for the ...
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0answers
26 views

Unity3d: Lines in Android build

I have a directional light pointing at the 3d objects. For some reasons, when I build to Android, the lighting produces multiple horizontal lines. It does not happen in other builds such as the ...
2
votes
2answers
91 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 ...
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vote
2answers
136 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 ...
2
votes
0answers
68 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" } ...
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0answers
81 views

Unity : shader that uses mesh.uv to tile texture atlas and mesh.uv2 to tile light atlas

I'm using a texture atlas and a light atlas to tile a mesh. I have the texture atlas working fine. I can apply textures and create a sort of tile map on my coded mesh. At the moment I'm using the ...
1
vote
2answers
113 views

Technique for multiple shadow casting lights in 2D

I'm trying to create shadows in a 2D game in such a way that I can have an arbitrary number of lights in a scene, all of which can cast shadows. To do this I think I have to generate a mesh for each ...
0
votes
1answer
178 views

Ogre: Light not reflecting correctly

In my Ogre 3d scene I have an empty box, and within that there are three small cubes. The camera is also within the box, facing the three small cubes. The user can move and rotate the camera with the ...
1
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2answers
85 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 ...
2
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0answers
683 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 ...
1
vote
2answers
136 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 ...
2
votes
1answer
324 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
192 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 ...
0
votes
0answers
40 views

VertexColor shader is not working correctly in built application

I want to change the vertex colors of my mesh. The light sources must not affect the objects with this shader, its lighting must be determined only by its vertices colors, so I turned the Lighting ...
0
votes
0answers
25 views

ColorMaterial:AmbientAndDiffuse equivalent for CG\HLSL

I have this shader written on shaderlab, which replaces Ambient and Diffuse values of the material, because I need to tweak vertices colors from the script. Shader "VertexSimple" { Properties ...
2
votes
2answers
193 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 ...
3
votes
1answer
257 views

Dynamic “Light Level” System based on alpha levels

My team and I have been working on a game in Java using the Slick2D engine and there are a few things I have questions on. As of right now, the code that I've written basically takes a cosine function ...
3
votes
1answer
160 views

How does pixel shading work for ambient occlusion volumes?

I'm trying to understand the ambient occlusion technique described here, but I've trouble comprehending what exactly is the pixel shader doing. Is the pixel shader invoked on points that belong to ...
2
votes
2answers
134 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? ...
4
votes
2answers
1k views

Lighting Objects with Textures - OpenGL

I'm trying to get lighting effects on a textured object; I'm using .obj and .mtl files to define them. No matter what I try my object is either invisible, unlit (plain texture), or completely white. ...
2
votes
1answer
124 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) ...
1
vote
1answer
78 views

Can you export lighting models directly from 3D application to a real time renderer?

is it possible for example to insert lighting in a 3D Model software like 3DSMAX and export an animated model like md5,..etc. and export the lighting too ?
4
votes
1answer
861 views

2D Software Lighting Issues in Java

I'm creating a 2D top-down tiled game in pure Java and by now I'm trying to implement a way to do lighting. First, some details on how I render: there is a screen class which handles all the ...
6
votes
1answer
140 views

Reducing Spherical Harmonic Ringing

I've generated some 2nd order SH light-probes from cube-maps in my scene and I was surprised how strong artifacts are around the back of the dominant lights. I switched to a Lambert source plus ...
1
vote
1answer
220 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 ...
6
votes
3answers
476 views

How can I create a shader that will reproduce this lighting effect on terrain?

Notice the way in which the major light source in each image reflects off the ground, as a function of the distance between the light source and the viewer (?). Is this a (bumped) specular map? ...