Refraction

[Josh]

An update on the beta branch adds the ability to create refraction effects. It's still pretty rough, but it works. This allows glass, heat haze, and other effects.

 

The attached zip contains a map, material, and new shader for handling refraction effects. At this time, water must be enabled for any refraction effects to work. I think it also works if one or more post-processing effects are enabled. texture10 must be declared in the shader, where the screen color texture will automatically be uploaded. (I know this is weird, but this will get better.)

 

 

I didn't put a lot of effort into the refraction shader because I figure you guys will go crazy making all kinds of things with it (especially Shadmar and Igor). So you can play with this now if you want to. The basic routine is there, and I just need to sort out the refracted tex coordinate.

 

This update only effects the editor, only on Windows.

refraction.zip

[macklebee]

Need to have colored shadows or be able to have something other than just dark shadows. Ruins the effect without it. The only other option is to not have shadows at all then it leaves you with a floating object that doesn't seem part of the scene.

[Josh]

If every other pixel is removed from the shadow it creates a semi-transparent shadow.

 

For clear glass I would not use any shadow.

[psychoanima]

Need to have colored shadows or be able to have something other than just dark shadows. Ruins the effect without it. The only other option is to not have shadows at all then it leaves you with a floating object that doesn't seem part of the scene.

 

You mean something like caustic effect?

[shadmar]

You can also use probes to make static refractions at almost no cost.

 

[macklebee]

If every other pixel is removed from the shadow it creates a semi-transparent shadow.

For clear glass I would not use any shadow.

You mean something like caustic effect?

 

I asked specifically about adding colored shadows for colored glass much like I showed in the video from 2 years ago. A black shadow for colored glass looks almost as bad as having no shadow.

 

And no, I mean colored shadows - something we had in LE2 over 6 years ago.

And no - not the purelight global illumination - but colored shadows. Granted i know I am asking too much since we cannot even get simple projected textures for lights that LE2 had for its entirety.

[Josh]

Funny you should mention that. In the editor on Windows in the beta, try adding a material with a texture in the first slot to a spotlight and watch what happens.

 

I don't plan to implement colored shadows. It's too obscure of a feature and won't get noticed or used.

 

I've got the refraction working with textureProj, just need to figure out how to use the normal to perturb the refraction vector correctly. This provides perfect accuracy but ignores the surface normal:

#version 400

#define BFN_ENABLED 1

 

//Uniforms

uniform sampler2D texture0;//diffuse map

uniform sampler2D texture1;//normal map

uniform sampler2D texture10;//screen color

uniform vec4 materialcolorspecular;

uniform vec4 lighting_ambient;

uniform samplerCube texture15;

uniform int decalmode;

uniform float materialroughness;

uniform sampler2DMS texture9;

uniform vec2 buffersize;

uniform bool isbackbuffer;

uniform vec2 camerarange;

uniform float camerazoom;

 

//Inputs

in vec2 ex_texcoords0;

in vec4 ex_color;

in float ex_selectionstate;

in vec3 ex_VertexCameraPosition;

in vec3 ex_normal;

in vec3 ex_tangent;

in vec3 ex_binormal;

in float clipdistance0;

 

out vec4 fragData0;

out vec4 fragData1;

out vec4 fragData2;

out vec4 fragData3;

 

void main(void)

{

//Clip plane discard

if (clipdistance0>0.0) discard;

 

vec4 outcolor = ex_color;

vec4 color_specular = materialcolorspecular;

 

//Normal map

vec3 normal = ex_normal;

normal = texture(texture1,ex_texcoords0).xyz * 2.0 - 1.0;

float ao = normal.z;

normal = ex_tangent*normal.x + ex_binormal*normal.y + ex_normal*normal.z;

normal=normalize(normal);

 

//---------------------------------------------------------------

//Refraction

//---------------------------------------------------------------

vec4 refractionvector = vec4( gl_FragCoord.x/buffersize.x, gl_FragCoord.y/buffersize.y, gl_FragCoord.z, 1.0 );

if (isbackbuffer) refractionvector.y = 1.0f - refractionvector.y;

vec2 texcoord = gl_FragCoord.xy / buffersize;

if (isbackbuffer) texcoord.y = 1.0f - texcoord.y;

vec4 screencolor = textureProj(texture10,refractionvector);

outcolor = screencolor * 0.75;

//---------------------------------------------------------------

//

//---------------------------------------------------------------

 

fragData0 = outcolor;

 

#if BFN_ENABLED==1

//Best-fit normals

fragData1 = texture(texture15,normalize(vec3(normal.x,-normal.y,normal.z)));

fragData1.a = fragData0.a;

#else

//Low-res normals

fragData1 = vec4(normalize(normal)*0.5+0.5,fragData0.a);

#endif

float specular = color_specular.r * 0.299 + color_specular.g * 0.587 + color_specular.b * 0.114;

int materialflags=1;

if (ex_selectionstate>0.0) materialflags += 2;

if (decalmode==1) materialflags += 4;//brush

if (decalmode==2) materialflags += 8;//model

if (decalmode==4) materialflags += 16;//terrain

if (materialroughness>=0.5)

{

materialflags += 32;

if (materialroughness>=0.75) materialflags += 64;

}

else

{

if (materialroughness>=0.25) materialflags += 64;

}

fragData1.a = materialflags/255.0;

fragData2 = vec4(0.0,0.0,0.0,specular);

}

[macklebee]

Funny you should mention that. In the editor on Windows in the beta, try adding a material with a texture in the first slot to a spotlight and watch what happens.

I must be doing something wrong because i see no difference after updating my project.

 

I don't plan to implement colored shadows. It's too obscure of a feature and won't get noticed or used.

Its hard to use something that doesn't get implemented. I have had a decent glass shader for a couple of years but no reason to use it when it looks weird with black or no shadows. But I will take what i can get if textures on lights work!

[Josh]

It only works in the editor at this point.

[Josh]

http://www.leadwerks.com/werkspace/page/viewitem?fileid=804131869