Поправить MotionBlur
Добавлено: 15 июн 2010, 13:34Нашел на оф форуме неплохой шейдер размытия движения, но как сказал сам создатель шейдера: там проблемы с вычислениями матриц. Я переписал скрипт управления данным шейдером на сишарп, переписал вычисления матриц, но все же шейдер работает не так, как хочется - размытие происходит только при движении объекта вверх / вниз и при поворотах (при поворотах особенно сильное размытие).
Переписанный скрипт управления:
Оригинальный скрипт управления:
Сам шейдер:
Еще раз напомню, что внимание, судя по всему, надо обратить на вычисления матриц.
Статья, по которой был написан шейдер
Переписанный скрипт управления:
Синтаксис:
Используется csharp
using UnityEngine;
using System.Collections;
[AddComponentMenu("Image Effects/CameraMotionBlur")]
[RequireComponent (typeof (Camera))]
public class MotionBlurComponent : MonoBehaviour {
public Shader blurShader;
public float strength = 12.0f;
public Transform target;
Material m_CompositeMaterial;
Material GetCompositeMaterial() {
if (!m_CompositeMaterial) {
m_CompositeMaterial = new Material(blurShader);
m_CompositeMaterial.hideFlags = HideFlags.HideAndDontSave;
}
return m_CompositeMaterial;
}
void OnDisable () {
DestroyImmediate(m_CompositeMaterial);
}
void OnPreCull () {
Matrix4x4 Iview = target.localToWorldMatrix * transform.worldToLocalMatrix * camera.projectionMatrix;
Shader.SetGlobalMatrix("_Myview", Iview.inverse);
}
void OnRenderImage (RenderTexture source, RenderTexture destination) {
Material compositeMat = GetCompositeMaterial();
compositeMat.SetFloat("_Strength", strength);
ImageEffects.BlitWithMaterial(compositeMat, source, destination);
}
void OnPostRender () {
StartCoroutine("RenderLate");
}
IEnumerator RenderLate () {
yield return new WaitForEndOfFrame();
Matrix4x4 Iviewprev = target.localToWorldMatrix * transform.worldToLocalMatrix * camera.projectionMatrix;
Shader.SetGlobalMatrix("_Myviewprev", Iviewprev);
}
}
using System.Collections;
[AddComponentMenu("Image Effects/CameraMotionBlur")]
[RequireComponent (typeof (Camera))]
public class MotionBlurComponent : MonoBehaviour {
public Shader blurShader;
public float strength = 12.0f;
public Transform target;
Material m_CompositeMaterial;
Material GetCompositeMaterial() {
if (!m_CompositeMaterial) {
m_CompositeMaterial = new Material(blurShader);
m_CompositeMaterial.hideFlags = HideFlags.HideAndDontSave;
}
return m_CompositeMaterial;
}
void OnDisable () {
DestroyImmediate(m_CompositeMaterial);
}
void OnPreCull () {
Matrix4x4 Iview = target.localToWorldMatrix * transform.worldToLocalMatrix * camera.projectionMatrix;
Shader.SetGlobalMatrix("_Myview", Iview.inverse);
}
void OnRenderImage (RenderTexture source, RenderTexture destination) {
Material compositeMat = GetCompositeMaterial();
compositeMat.SetFloat("_Strength", strength);
ImageEffects.BlitWithMaterial(compositeMat, source, destination);
}
void OnPostRender () {
StartCoroutine("RenderLate");
}
IEnumerator RenderLate () {
yield return new WaitForEndOfFrame();
Matrix4x4 Iviewprev = target.localToWorldMatrix * transform.worldToLocalMatrix * camera.projectionMatrix;
Shader.SetGlobalMatrix("_Myviewprev", Iviewprev);
}
}
Оригинальный скрипт управления:
Синтаксис:
Используется javascript
#pragma strict
@script ExecuteInEditMode
@script AddComponentMenu("Image Effects/CameraMBlur")
@script RequireComponent(Camera)
var compositeShader : Shader;
var Strength = 13.0;
private var m_CompositeMaterial : Material;
private function GetCompositeMaterial() : Material {
if (m_CompositeMaterial == null) {
m_CompositeMaterial = new Material( compositeShader );
m_CompositeMaterial.hideFlags = HideFlags.HideAndDontSave;
}
return m_CompositeMaterial;
}
function OnDisable() {
DestroyImmediate (m_CompositeMaterial);
}
function OnPreCull()
{
var Iview=(camera.worldToCameraMatrix.inverse * camera.projectionMatrix);
Shader.SetGlobalMatrix("_Myview", Iview.inverse);
}
// Called by the camera to apply the image effect
function OnRenderImage (source : RenderTexture, destination : RenderTexture) : void
{
var compositeMat = GetCompositeMaterial();
compositeMat.SetFloat("_Strength", Strength);
ImageEffects.BlitWithMaterial(compositeMat, source, destination);
}
function OnPostRender()
{
renderlate();
}
function renderlate ()
{
yield WaitForEndOfFrame();
var Iviewprev=(camera.worldToCameraMatrix.inverse * camera.projectionMatrix);
Shader.SetGlobalMatrix("_Myviewprev", Iviewprev);
}
@script ExecuteInEditMode
@script AddComponentMenu("Image Effects/CameraMBlur")
@script RequireComponent(Camera)
var compositeShader : Shader;
var Strength = 13.0;
private var m_CompositeMaterial : Material;
private function GetCompositeMaterial() : Material {
if (m_CompositeMaterial == null) {
m_CompositeMaterial = new Material( compositeShader );
m_CompositeMaterial.hideFlags = HideFlags.HideAndDontSave;
}
return m_CompositeMaterial;
}
function OnDisable() {
DestroyImmediate (m_CompositeMaterial);
}
function OnPreCull()
{
var Iview=(camera.worldToCameraMatrix.inverse * camera.projectionMatrix);
Shader.SetGlobalMatrix("_Myview", Iview.inverse);
}
// Called by the camera to apply the image effect
function OnRenderImage (source : RenderTexture, destination : RenderTexture) : void
{
var compositeMat = GetCompositeMaterial();
compositeMat.SetFloat("_Strength", Strength);
ImageEffects.BlitWithMaterial(compositeMat, source, destination);
}
function OnPostRender()
{
renderlate();
}
function renderlate ()
{
yield WaitForEndOfFrame();
var Iviewprev=(camera.worldToCameraMatrix.inverse * camera.projectionMatrix);
Shader.SetGlobalMatrix("_Myviewprev", Iviewprev);
}
Сам шейдер:
Синтаксис:
Используется glsl
Shader "CameraMBlur" {
Properties {
_MainTex ("", RECT) = "white" {}
_Strength ("Strength", Range (1, 30)) = 15.0
}
SubShader {
Pass {
ZTest Always Cull off ZWrite Off Fog { Mode off }
CGPROGRAM
#pragma fragment frag
#pragma fragmentoption ARB_precision_hint_fastest
#include "UnityCG.cginc"
uniform samplerRECT _MainTex;
struct v2f {
float4 pos : POSITION;
float2 uv : TEXCOORD0;
};
v2f vert (appdata_base v)
{
v2f o;
o.pos = mul (glstate.matrix.mvp, v.vertex);
o.uv.xy=v.texcoord;
return o;
}
uniform float4x4 _Myview;
uniform float4x4 _Myviewprev;
uniform float _Strength;
half4 frag (v2f i) : COLOR
{
float2 Texcoord =i.uv;
// Get the depth buffer value at this pixel.
float zOverW = 1;
// H is the viewport position at this pixel in the range -1 to 1.
float4 H = float4(Texcoord.x * 2 - 1, (1 - Texcoord.y) * 2 - 1,zOverW, 1);
// Transform by the view-projection inverse.
float4 D = mul(H, _Myview);
// Divide by w to get the world position.
float4 worldPos = D / D.w;
// Current viewport position
float4 currentPos = H;
// Use the world position, and transform by the previous view-
// projection matrix.
float4 previousPos = mul(worldPos, _Myviewprev);
// Convert to nonhomogeneous points [-1,1] by dividing by w.
previousPos /= previousPos.w;
// Use this frame's position and last frame's to compute the pixel
// velocity.
float2 velocity = (currentPos - previousPos)/_Strength;
// Get the initial color at this pixel.
float4 color = texRECT(_MainTex, Texcoord);
Texcoord += velocity;
for(int i = 1; i < 12; ++i, Texcoord += velocity)
{
// Sample the color buffer along the velocity vector.
float4 currentColor = texRECT(_MainTex, Texcoord);
// Add the current color to our color sum.
color += currentColor;
}
// Average all of the samples to get the final blur color.
float4 finalColor = color / 12;
return finalColor;
}
ENDCG
}
}
Fallback off
}
Properties {
_MainTex ("", RECT) = "white" {}
_Strength ("Strength", Range (1, 30)) = 15.0
}
SubShader {
Pass {
ZTest Always Cull off ZWrite Off Fog { Mode off }
CGPROGRAM
#pragma fragment frag
#pragma fragmentoption ARB_precision_hint_fastest
#include "UnityCG.cginc"
uniform samplerRECT _MainTex;
struct v2f {
float4 pos : POSITION;
float2 uv : TEXCOORD0;
};
v2f vert (appdata_base v)
{
v2f o;
o.pos = mul (glstate.matrix.mvp, v.vertex);
o.uv.xy=v.texcoord;
return o;
}
uniform float4x4 _Myview;
uniform float4x4 _Myviewprev;
uniform float _Strength;
half4 frag (v2f i) : COLOR
{
float2 Texcoord =i.uv;
// Get the depth buffer value at this pixel.
float zOverW = 1;
// H is the viewport position at this pixel in the range -1 to 1.
float4 H = float4(Texcoord.x * 2 - 1, (1 - Texcoord.y) * 2 - 1,zOverW, 1);
// Transform by the view-projection inverse.
float4 D = mul(H, _Myview);
// Divide by w to get the world position.
float4 worldPos = D / D.w;
// Current viewport position
float4 currentPos = H;
// Use the world position, and transform by the previous view-
// projection matrix.
float4 previousPos = mul(worldPos, _Myviewprev);
// Convert to nonhomogeneous points [-1,1] by dividing by w.
previousPos /= previousPos.w;
// Use this frame's position and last frame's to compute the pixel
// velocity.
float2 velocity = (currentPos - previousPos)/_Strength;
// Get the initial color at this pixel.
float4 color = texRECT(_MainTex, Texcoord);
Texcoord += velocity;
for(int i = 1; i < 12; ++i, Texcoord += velocity)
{
// Sample the color buffer along the velocity vector.
float4 currentColor = texRECT(_MainTex, Texcoord);
// Add the current color to our color sum.
color += currentColor;
}
// Average all of the samples to get the final blur color.
float4 finalColor = color / 12;
return finalColor;
}
ENDCG
}
}
Fallback off
}
Еще раз напомню, что внимание, судя по всему, надо обратить на вычисления матриц.
Статья, по которой был написан шейдер
