Course Daniel.
It is a puzzle game in which we must join pieces of the same color. Once joined, they disappear. To create the effect for destruction, I am applying a blur and glow by shader replacement. Basically when I want enable the effect of destruction I change the shader of the material for one with a specific tag used in the script attached to the camera.
This is some code of the camera script:
public void OnPreRender()
{
if (!enabled || !gameObject.active || !shader)
return;
//Release effects texture
if (effectsTexture != null) {
RenderTexture.ReleaseTemporary (effectsTexture);
effectsTexture = null;
}
//Create effects camera if doesn't exists
if(!effectsCamera)
{
effectsCamera = new GameObject("EffectsCamera", typeof(Camera));
effectsCamera.camera.enabled = false;
effectsCamera.hideFlags = HideFlags.HideAndDontSave;
}
//Gets effects texture
Camera auxCam = effectsCamera.camera;
auxCam.camera.CopyFrom(camera);
auxCam.camera.clearFlags = CameraClearFlags.SolidColor;
effectsTexture = RenderTexture.GetTemporary(Screen.width, Screen.height,1);
auxCam.camera.targetTexture = effectsTexture;
auxCam.camera.backgroundColor = Color.clear;
auxCam.camera.RenderWithShader(shader, "RenderType");
}
public void OnRenderImage(RenderTexture source, RenderTexture destination)
{
RenderTexture buffer = RenderTexture.GetTemporary(source.width, source.height, 0);
RenderTexture buffer2 = RenderTexture.GetTemporary(source.width, source.height, 0);
// Copy things mask to the 4x4 smaller texture.
this.downSample(effectsTexture, buffer);
// Blur the small texture
var oddEven = true;
for(var i = 0; i < iterations; i++)
{
if( oddEven )
FourTapCone(buffer, buffer2, i);
else
FourTapCone(buffer2, buffer, i);
oddEven = !oddEven;
}
Material compositeMat = this.getCompositeMaterial();
compositeMat.SetTexture("_BlurTex2", oddEven ? buffer : buffer2);
ImageEffects.BlitWithMaterial(compositeMat, source, destination);
RenderTexture.ReleaseTemporary(buffer);
RenderTexture.ReleaseTemporary(buffer2);
if (effectsTexture != null) {
RenderTexture.ReleaseTemporary (effectsTexture);
effectsTexture = null;
}
}
That is the shader applied to to the piece to enable the effect
Shader "PostProcess/Transparent" {
Properties {
_Color ("Main Color", Color) = (1,1,1,1)
}
SubShader {
Tags { "RenderType"="PostProcess" }
Pass {
//Wont be rendered at scene camera
AlphaTest Never 0
}
}
}
Ok, if I now use for example the following shader as the replacement shader the results are like I expected:
Shader "PostProcess/Replacement" {
Properties {
_Color ("Main Color", Color) = (1,1,1,1)
_SpecColor ("Specular Color", Color) = (0.5, 0.5, 0.5, 1)
_Shininess ("Shininess", Range (0.03, 1)) = 0.078125
_MainTex ("Base (RGB) Gloss (A)", 2D) = "white" {}
_BumpMap ("Normalmap", 2D) = "bump" {}
}
SubShader {
Tags {"RenderType" = "PostProcess" }
Pass{
Fog { Mode Off }
Color [_Color]
}
}
}
This is the normal scene camera:
This the effects camera (when destruction effect is enabled):
And this is the scene resulting from combining the two cameras:
Untill now everithing seems ok, but I want to render the pieces like Bumped Specular when effect is applied. So if I change the replacement shader for the following (built in Bumped Specular source changing the tag):
Shader "PostProcess/Replacement" {
Properties {
_Color ("Main Color", Color) = (1,1,1,1)
_SpecColor ("Specular Color", Color) = (0.5, 0.5, 0.5, 1)
_Shininess ("Shininess", Range (0.03, 1)) = 0.078125
_MainTex ("Base (RGB) Gloss (A)", 2D) = "white" {}
_BumpMap ("Normalmap", 2D) = "bump" {}
}
SubShader {
Tags {"RenderType" = "PostProcess" }
LOD 400
CGPROGRAM
#pragma surface surf BlinnPhong
sampler2D _MainTex;
sampler2D _BumpMap;
float4 _Color;
float _Shininess;
struct Input {
float2 uv_MainTex;
float2 uv_BumpMap;
};
void surf (Input IN, inout SurfaceOutput o) {
half4 tex = tex2D(_MainTex, IN.uv_MainTex);
o.Albedo = tex.rgb * _Color.rgb;
o.Gloss = tex.a;
o.Alpha = tex.a * _Color.a;
o.Specular = _Shininess;
o.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_BumpMap));
}
ENDCG
}
FallBack "Specular"
}
The resulting effect camera rendering is:
