HLSL效果框架-多光源效果
昨日不可追, 今日尤可为.勤奋,炽诚,不忘初心
高级着色器语言(HLSL)难就难在它是运行在GPU,CPU上的,编写和调试都很麻烦.
用效果框架简化了不少操做,先列出着色器的代码,重点部分都用中文注释了
着色器语言文件为:
,代码为:算法
//着色器处理未知数量光源数目 未知光源种类 的 混合效果
//HLSL里一共支持256个float4,一个int最后也转成float4,float4x3和float3x3占内存同样,最终都变成float4
//由于HLSL的限制条件很是零散也很是多,因此,用起来仍是很吃力的,在不懂的状况下,
//最终指令不能超过500多条貌似,运行在显卡中程序,因此能省则省,能精简则精简!!!
//
//结构体 注意:为了优化结构,把一些相关参数整合到了一块儿
//
struct PointLight //点光源 结构
{
float4 Diffuse; //漫反射的颜色r,g,b,a
float4 Specular; //镜面高光的颜色r,g,b,a
float4 Position; //光源位置x,y,z,w没用到
float4 RangeAttenuation;//范围,恒定衰减,光强,二次衰减
};
struct DirectLight //方向光 结构
{
float4 Diffuse; //漫反射的颜色r,g,b,a
float4 Specular; //镜面高光的颜色r,g,b,a
float4 Direction; //方向x,y,z,高光
};
struct SpotLight //聚光灯 结构
{
float4 Diffuse; //漫反射的颜色r,g,b,a
float4 Specular; //镜面高光的颜色r,g,b,a
float4 Position; //光源位置x,y,z,w没用到
float4 Direction; //方向x,y,z,w没用到
float4 RangeAttenuation;//范围,恒定衰减,光强,二次衰减
float4 FalloffThetaPhi; //从内锥到外锥之间的强度衰减,y没用到,内锥的弧度,外锥的弧度
};
//接收光源的数量
int g_NumPLs; //程序里定义了几个点光源?
int g_NumDLs; //程序里定义了几个方向光源?
int g_NumSLs; //程序里定义了几个方向光源?
PointLight g_PLs[10]; //定义最多支持10个点光源
DirectLight g_DLs[10]; //定义最多支持10个方向光源
SpotLight g_SLs[10]; //定义最多支持10个聚光灯光源
//环境光(对于多灯光的场合，对每个灯光循环进行这些运算（环境光除外）)
//最后加上环境光(假设只有一个环境光)
matrix g_WorldMatrix;//世界矩阵
float4 g_ViewPos;//观察点(相机)
matrix WVPMatrix; //世界-观察-投影矩阵
float AmbAmount; //环境光的强弱程度,介于0-1之间
float4 AmbCol = { 1.0f, 1.0f, 1.0f, 1.0f };//环境光的颜色,默认白色
//--------------------------------------------------------------------------
// 顶点着色器(注意看下面,我把顶点着色器的输出顶点位置和法线,看成像素着色器的输入了!!!
// TEXCOORD这类寄存器也没啥用,用来保存顶点和法线数据最合适不过了,最多好像是15个)
//--------------------------------------------------------------------------
struct VS_INPUT //输入结构
{
float4 position : POSITION;//输入:坐标
float3 normal : NORMAL; //输入:法线
};
struct VS_OUTPUT //输出结构
{
float4 position : POSITION;
float4 vtpos : TEXCOORD0;//传入像素着色器用,TEXCOORD表示寄存器名字,(实际上保存的数据当像素着色器的输入坐标用,用TEXCOORD,一方面是多,二方面没啥用)
float3 normal : TEXCOORD1;
};
VS_OUTPUT VS_Main(VS_INPUT input)
{
VS_OUTPUT output = (VS_OUTPUT)0;
output.vtpos = input.position;//模型本地空间坐标
output.position = mul(input.position, WVPMatrix);//输出:世界-观察-投影变幻后的坐标
output.normal = input.normal;
return output;
}
//--------------------------------------------------------------------------
// 像素着色器(COLOR0是必须输出的,其余的可做任何用途)
//--------------------------------------------------------------------------
struct PS_INPUT //输入
{
float4 vtpos : TEXCOORD0;//顶点位置(接受顶点着色器的输出,要对应)
float3 normal : TEXCOORD1;
};
struct PS_OUTPUT //输出像素颜色
{
float4 Color : COLOR0; //像素着色器最终输出计算好的颜色
};
PS_OUTPUT PS_Main(PS_INPUT input)
{
PS_OUTPUT output = (PS_OUTPUT)0;
float4 worldpos = mul(input.vtpos, g_WorldMatrix);//顶点在世界空间中的坐标,即乘以世界矩阵
float4 colRes;//用于保存最终的颜色 = E环境光+自身光+E(点光+方向光+聚光); 其中点,方向,聚光 又包含漫反射,镜面反射
float4 ambient = { 0.0f, 0.0f, 0.0f, 1.0f };//总环境光
float4 self = { 0.0f, 0.0f, 0.0f, 1.0f };//自发光
float4 diffuse = { 0.0f, 0.0f, 0.0f, 1.0f };//总漫反射光
float4 specular = { 0.0f, 0.0f, 0.0f, 1.0f };//总镜面反射
ambient = AmbCol * AmbAmount;//求出环境光
for (int i = 0; i < g_NumPLs; i++)//点光源
{
float3 dirSize = input.vtpos.xyz - g_PLs[i].Position.xyz;//光源到顶点的方向和大小.光源→顶点pos
float distance = length(dirSize);//距离
float3 dir = normalize(dirSize);//单位化方向
if (distance < g_PLs[i].RangeAttenuation.x)//顶点在灯光范围内
{
//求出漫反射
float difusefactor = dot(dir.xyz, input.normal.xyz);
if (difusefactor < 0)
{
difusefactor = 0;
}
float distanceDec = 1.0f - 1.0f / g_PLs[i].RangeAttenuation.x * distance;
//漫反射 = diffuse*漫反射因子*距离衰减
diffuse.xyz += g_PLs[i].Diffuse.xyz * difusefactor * distanceDec;//最后要乘以材质的吸取系数(这里没乘)
//下面求镜面反射(镜面反射的算法本身去百度找吧...)
float3 DirectionToView = normalize(worldpos.xyz - g_ViewPos.xyz); //(同在世界空间中!)
float3 VectorToLight = normalize(input.vtpos.xyz - g_PLs[i].Position.xyz);
//计算反射光
float3 reflectanceRay = 2 * dot(input.normal.xyz, VectorToLight.xyz)*input.normal.xyz - VectorToLight.xyz;
float specfactor = pow(abs(dot(reflectanceRay, DirectionToView)), g_PLs[i].RangeAttenuation.z);
//镜面光累加
specular.xyz += g_PLs[i].Specular.xyz * specfactor;//最后要乘以材质的吸取系数(这里没乘)
}
//else在光线外,无此光照影响
}
for (int j = 0; j < g_NumDLs; j++)//方向光源
{
//漫反射
float3 dir = normalize(g_DLs[j].Direction.xyz);//单位化方向(光的方向)
float difusefactor = dot(dir.xyz, input.normal.xyz);
if (difusefactor < 0)
{
difusefactor = 0;
}
diffuse.xyz += g_DLs[j].Diffuse.xyz * difusefactor;//最后要乘以材质的吸取系数(这里没乘)
//镜面反射
float3 DirectionToView = normalize(worldpos.xyz - g_ViewPos.xyz);//观察点→顶点 (同在世界空间中!)
//dir 已有
//计算反射光
float3 reflectanceRay = 2 * dot(input.normal.xyz, dir.xyz)*input.normal.xyz - dir.xyz;
float specfactor = pow(abs(dot(reflectanceRay, DirectionToView)), g_DLs[j].Direction.w);
//镜面光累加
specular.xyz += g_DLs[j].Specular.xyz * specfactor;//最后要乘以材质的吸取系数(这里没乘)
}
for (int k = 0; k < g_NumSLs; k++)//聚光灯
{
float disdec = 0.0f;//距离衰减
float raddec = 0.0f;//角度衰减
float distance = length(g_SLs[k].Position.xyz - worldpos.xyz);//光源到顶点的距离
float3 xconeDirection = normalize(g_SLs[k].Direction.xyz);//聚光灯方向
float3 ltvdir = normalize(g_SLs[k].Position.xyz - worldpos.xyz);//光到顶点的方向
float cosx = abs(dot(xconeDirection, ltvdir));//夹角的余弦值
float cosPhi = cos(g_SLs[k].FalloffThetaPhi.w / 2.0f);
float cosTheta = cos(g_SLs[k].FalloffThetaPhi.z / 2.0f);
//距离衰减因子
float sss = 1.0f / g_SLs[k].RangeAttenuation.x;
if (cosx>cosTheta)//本影(角度衰减: 不衰减)
{
raddec = 1.0f;
if (distance*cosx <g_SLs[k].RangeAttenuation.x)//在射程范围内
{
disdec = 1.0f - 1.0f / g_SLs[k].RangeAttenuation.x*distance*cosx;//距离衰减(线性衰减)
}
}
if (cosx < cosTheta)//本影外(角度衰减: 急剧衰减 )
{
float v1 = cosx - cosPhi;
float v2 = cosTheta - cosPhi;
float v3 = v1 / v2;
raddec = pow(abs(v3), g_SLs[k].FalloffThetaPhi.x);
if (distance*cosx <g_SLs[k].RangeAttenuation.x)//在射程范围内(无光)
{
disdec = 1.0f - 1.0f / g_SLs[k].RangeAttenuation.x*distance*cosx; //距离衰减(线性衰减)
}
}
if (cosx<cosPhi)//光锥外
{
raddec = 0.0f;
}
//计算漫反射
float difusefactor = dot(ltvdir.xyz, input.normal.xyz);
if (difusefactor < 0.0f)
{
difusefactor = 0.0f;
}
diffuse.xyz += g_SLs[k].Diffuse.xyz * raddec * disdec * difusefactor;//最后要乘以材质的吸取系数(这里没乘)
//计算镜面反射
float3 DirectionToView = normalize(worldpos.xyz - g_ViewPos.xyz);//观察点→顶点 (同在世界空间中!)
float3 VectorToLight = normalize(input.vtpos.xyz - g_SLs[k].Position.xyz);
//计算反射光
float3 reflectanceRay = 2 * dot(input.normal.xyz, VectorToLight.xyz)*input.normal.xyz - VectorToLight.xyz;
float specfactor = pow(abs(dot(reflectanceRay, DirectionToView)), g_SLs[k].RangeAttenuation.z);
//镜面光累加
specular.xyz += g_SLs[k].Specular.xyz * raddec * disdec * specfactor;//最后要乘以材质的吸取系数(这里没乘)
}
output.Color.w = 1.0f;//由于output被初始化为(PS_OUTPUT)0,w也初始化为0了.
output.Color.xyz = ambient.xyz + self.xyz + diffuse.xyz + specular.xyz;//把全部种类的光都累加起来
return output;
}
//--------------------------------------------------------------------------
// 框架效果
//--------------------------------------------------------------------------
technique MulLights
{
pass P0
{
vertexShader = compile vs_3_0 VS_Main();//顶点着色器
pixelshader = compile ps_3_0 PS_Main();//像素着色器
}
}
值得注意的是,环境光也能够有好几个(这里假设只有一个),另外,光照的最终叠加效果公式为:
最终光照颜色 = 全部的环境光 * 材质吸取指数 + 自发光 + (点光源 + 方向光源+聚光灯) * (漫反射 + 镜面反射) *材质吸取指数
(本身推算的公式,可能有误,欢迎批评指出)
而后是应用程序中的代码:
变量定义:
D3DXMATRIX m_ProjMatrix; //投影矩阵
D3DXMATRIX m_ViewMatrix; //观察矩阵
//四个模型
ID3DXMesh* m_Meshes[4];
D3DXMATRIX m_WorldMatrices[4];
D3DXVECTOR4 m_MeshColors[4];
D3DMATERIAL9 m_Material;
//点光源
PointLight m_PointLight[10];
DirectLight m_DirectLight[10];
SpotLight m_SpotLight[10];
//-----------顶点着色器相关------------------
D3DXHANDLE m_WVPMatrixHandle;//世界-观察-投影矩阵句柄
//-----------效果框架-----------------
ID3DXEffect* m_NLightEffect = 0;
//-----------------句柄------------------------
D3DXHANDLE m_TecniMulLightsHandle = 0; //技术句柄
D3DXHANDLE m_AmbAmountHandle = 0; //环境光系数句柄
//各类光源句柄
D3DXHANDLE m_PointLHandle = 0; //点光源句柄
D3DXHANDLE m_DirectLightHandle = 0; //方向光句柄
D3DXHANDLE m_SpotLightHandle = 0; //聚光灯句柄
//各类光源数量句柄
D3DXHANDLE m_NumPointLightHandle = 0; //点光源个数句柄
D3DXHANDLE m_NumDirectLightHandle = 0; //方向光个数句柄
D3DXHANDLE m_NumSpotLightHandle = 0; //聚光灯个数句柄
D3DXHANDLE m_ViewPosHandle = 0; //观察点句柄
D3DXHANDLE m_WorldMatrixHandle = 0; //世界矩阵句柄
#define MESH_TEAPOT 0
#define MESH_SPHERE 1
#define MESH_TORUS 2
#define MESH_CYLINDER 3
typedef D3DXVECTOR4 float4; //这里typedef成float4,就能与着色器里面一致,不须要改代码了!
struct PointLight
{
float4 Diffuse; //漫反射的颜色
float4 Specular; //镜面高光的颜色
float4 Position; //光源位置
float4 RangeAttenuation;//范围,恒定衰减,镜面光强弱,二次衰减
};
struct DirectLight
{
float4 Diffuse; //漫反射的颜色
float4 Specular; //镜面高光的颜色
float4 DirectionPow; //方向x,y,z,高光
};
struct SpotLight
{
float4 Diffuse; //漫反射的颜色
float4 Specular; //镜面高光的颜色
float4 Position; //光源位置
float4 Direction; //方向
float4 RangeAttenuation;//范围,恒定衰减,镜面光强弱,二次衰减
float4 FalloffThetaPhi; //从内锥到外锥之间的强度衰减,NULL,内锥的弧度,外锥的弧度
};
//setup: main函数中调用一次
void Setup()
{
HRESULT hr = 0;
//建立模型们: 茶壶 圆球 圆环 圆桶
D3DXCreateTeapot(m_d3dDevice->GetD3DDevice(), &m_Meshes[MESH_TEAPOT], NULL);
D3DXCreateSphere(m_d3dDevice->GetD3DDevice(), 1.0f, 20, 20, &m_Meshes[MESH_SPHERE], NULL);
D3DXCreateTorus(m_d3dDevice->GetD3DDevice(), 0.5f, 1.0f, 20, 20, &m_Meshes[MESH_TORUS], NULL);
D3DXCreateCylinder(m_d3dDevice->GetD3DDevice(), 0.5f, 0.5f, 2.0f, 20, 20, &m_Meshes[MESH_CYLINDER], NULL);
//模型们的在世界中的矩阵:
D3DXMatrixTranslation(&m_WorldMatrices[MESH_TEAPOT], 0.0f, 2.0f, 0.0f);
D3DXMatrixTranslation(&m_WorldMatrices[MESH_SPHERE], 0.0f, -2.0f, 0.0f);
D3DXMatrixTranslation(&m_WorldMatrices[MESH_TORUS], -3.0f, 0.0f, 0.0f);
D3DXMatrixTranslation(&m_WorldMatrices[MESH_CYLINDER], 3.0f, 0.0f, 0.0f);
//模型们的颜色:
m_MeshColors[MESH_TEAPOT] = D3DXVECTOR4(1.0f, 1.0f, 1.0f, 1.0f);
m_MeshColors[MESH_SPHERE] = D3DXVECTOR4(1.0f, 1.0f, 1.0f, 1.0f);
m_MeshColors[MESH_TORUS] = D3DXVECTOR4(1.0f, 1.0f, 1.0f, 1.0f);
m_MeshColors[MESH_CYLINDER] = D3DXVECTOR4(1.0f, 1.0f, 1.0f, 1.0f);
//
//建立两个点光源
//m_PointLight[0]
m_PointLight[0].Diffuse = { 1.0f, 0.0f, 0.0f, 1.0f };//Diffuse
m_PointLight[0].Specular = { 1.0f, 1.0f, 1.0f, 1.0f };//Specular
m_PointLight[0].Position = { -6.0f, 2.0f, 2.0f, 0.0f };//Position
m_PointLight[0].RangeAttenuation = { 15.0f, 1.0f, 50.0f, 0.0f };//Range,Attenuation0,镜面光强弱,Attenuation2
//m_PointLight[1]
m_PointLight[1].Diffuse = { 0.0f, 1.0f, 0.0f, 1.0f };
m_PointLight[1].Specular = { 1.0f, 1.0f, 1.0f, 1.0f };
m_PointLight[1].Position = { 6.0f, 2.0f, 3.0f, 0.0f };
m_PointLight[1].RangeAttenuation = { 15.0f, 0.8f, 50.0f, 0.0f };
//建立一个方向光
//m_DirectLight[0]
m_DirectLight[0].Diffuse = { 0.5f, 0.5f, 0.5f, 1.0f };
m_DirectLight[0].Specular = { 0.5f, 0.5f, 0.5f, 1.0f };
m_DirectLight[0].DirectionPow = { 0.0f, 0.0f, -1.0f, 10.0f };//(z轴正方向)
//建立一个聚光灯
//m_SpotLight[0]
m_SpotLight[0].Diffuse = { 1.0f, 1.0f, 1.0f, 1.0f };
m_SpotLight[0].Specular = { 1.0f, 1.0f, 1.0f, 1.0f };
m_SpotLight[0].Position = { 0.0f, 1.8f, -5.0f, 0.0f };
m_SpotLight[0].Direction = { 0.0f, 0.0f, 1.0f, 0.0f };
m_SpotLight[0].FalloffThetaPhi = { 3.5f, 0.0f, 0.04f, 0.18f };//衰减,-,内角(弧度半角),外角(弧度半角)
m_SpotLight[0].RangeAttenuation = { 10.0f, 0.0f, 20.0f, 0.0f };//范围,衰减1,高光,衰减2
ID3DXBuffer* errorBuffer = 0;
hr = D3DXCreateEffectFromFile(m_d3dDevice->GetD3DDevice(),
L"D:\\nlight.fx",
0,
0,
D3DXSHADER_ENABLE_BACKWARDS_COMPATIBILITY,
0,
&m_NLightEffect,
&errorBuffer);
// 输出错误信息:
if (errorBuffer)
{
string str = (char*)errorBuffer->GetBufferPointer();
MessageBox(NULL, Common::StringToWString(str).c_str(), L"ERROR", MB_OK);
//safe_release<ID3DXBuffer*>(error_buffer);
}
if (FAILED(hr))
{
MessageBox(NULL, L"D3DXCreateEffectFromFile() - FAILED", L"ERROR", MB_OK);
}
//获取hlsl中常量句柄
//获得技术technique MulLights的句柄
m_TecniMulLightsHandle = m_NLightEffect->GetTechniqueByName("MulLights");
//各类光源的个数
m_NumPointLightHandle = m_NLightEffect->GetParameterByName(NULL, "g_NumPLs");
m_NumDirectLightHandle = m_NLightEffect->GetParameterByName(NULL, "g_NumDLs");
m_NumSpotLightHandle = m_NLightEffect->GetParameterByName(NULL, "g_NumSLs");
//获取光源种类的句柄
m_AmbAmountHandle = m_NLightEffect->GetParameterByName(NULL, "AmbAmount");//环境光因子句柄
m_PointLHandle = m_NLightEffect->GetParameterByName(NULL, "g_PLs");//点光源句柄
m_DirectLightHandle = m_NLightEffect->GetParameterByName(NULL, "g_DLs");//方向光句柄
m_SpotLightHandle = m_NLightEffect->GetParameterByName(NULL, "g_SLs");//聚光灯句柄
//获取观察点,矩阵句柄
m_ViewPosHandle = m_NLightEffect->GetParameterByName(NULL, "g_ViewPos");
m_WorldMatrixHandle = m_NLightEffect->GetParameterByName(NULL, "g_WorldMatrix");
m_WVPMatrixHandle = m_NLightEffect->GetParameterByName(NULL, "WVPMatrix");//世界观察投影矩阵
//设置常量句柄
//传光源数据进去
m_NLightEffect->SetRawValue(m_PointLHandle, m_PointLight, 0,sizeof(PointLight)*2);//传点光源
m_NLightEffect->SetRawValue(m_DirectLightHandle, m_DirectLight, 0, sizeof(DirectLight)* 1);//传方向光
m_NLightEffect->SetRawValue(m_SpotLightHandle, m_SpotLight, 0, sizeof(SpotLight)* 1);//传聚光灯
m_NLightEffect->SetFloat(m_AmbAmountHandle, 0.0f);
m_NLightEffect->SetInt(m_NumPointLightHandle, 2);//点光源数量:2 (调节个数可方便调试)
m_NLightEffect->SetInt(m_NumDirectLightHandle, 1);//方向光数量:1
m_NLightEffect->SetInt(m_NumSpotLightHandle, 1);//聚光灯数量:1
//设置投影矩阵
RECT rt;
GetClientRect(Application::GetInstance()->GetWnd(), &rt);
D3DXMatrixPerspectiveFovLH(&m_ProjMatrix, D3DX_PI / 4.0f, (float)rt.right / rt.bottom, 1.0f, 1000.0f);
//暂时未设置纹理
m_d3dDevice->GetD3DDevice()->SetRenderState(D3DRS_LIGHTING, false);//关闭灯光,即不用固定管线
}
//display: 在消息循环中调用,时时更新
void Display(float timeDelta)
{
static float angle = (3.0f * D3DX_PI) / 2.0f;
static float height = 0.0f;
if (GetAsyncKeyState(VK_LEFT) & 0x8000f)
angle -= 0.5f * timeDelta;
if (GetAsyncKeyState(VK_RIGHT) & 0x8000f)
angle += 0.5f * timeDelta;
if (GetAsyncKeyState(VK_UP) & 0x8000f)
height += 5.0f * timeDelta;
if (GetAsyncKeyState(VK_DOWN) & 0x8000f)
height -= 5.0f * timeDelta;
//求出观察矩阵
D3DXVECTOR3 position(cosf(angle) * 7.0f, height, sinf(angle) * 7.0f);
D3DXVECTOR3 target(0.0f, 0.0f, 0.0f);
D3DXVECTOR3 up(0.0f, 1.0f, 0.0f);
D3DXMatrixLookAtLH(&m_ViewMatrix, &position, &target, &up);
D3DXVECTOR4 vps = { cosf(angle) * 7.0f, height, sinf(angle) * 7.0f, 0.0f };
m_NLightEffect->SetVector(m_ViewPosHandle, &vps);
// render now
m_d3dDevice->GetD3DDevice()->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, 0x99999999, 1.0f, 0);
m_d3dDevice->GetD3DDevice()->BeginScene();
//设置技术
m_NLightEffect->SetTechnique(m_TecniMulLightsHandle);
D3DXMATRIX WVPMatrix;
for (int i = 0; i < 4; i++)
{
WVPMatrix = m_WorldMatrices[i] * m_ViewMatrix * m_ProjMatrix;
m_NLightEffect->SetMatrix(m_WorldMatrixHandle, &m_WorldMatrices[i]);
m_NLightEffect->SetMatrix(m_WVPMatrixHandle, &WVPMatrix);
UINT numPass = 0;
m_NLightEffect->Begin(&numPass, 0);
for (UINT j = 0; j < numPass; ++j)
{
//开始过程
m_NLightEffect->BeginPass(j); //在begin和end中间不建议设置着色器变量
m_Meshes[i]->DrawSubset(0);
//结束过程
m_NLightEffect->EndPass();
}
//结束使用技术
m_NLightEffect->End();
}
m_d3dDevice->GetD3DDevice()->EndScene();
m_d3dDevice->GetD3DDevice()->Present(NULL, NULL, NULL, NULL);
}
测试一: 1个点光源:
发现了一个错误!!!:黑色的地方没有光照,竟然也有镜面反射了,oh,shit,网上的算法也不严谨嘛...
解决方法:稍微一思考,有光的地方才有镜面反射对吧?怎么样才有光? 就是光线方向和面法线的夹角要大于0,
即difusefactor = dot(光线,面法线)>0.0f; 即difusefactor>0.0f,因此,HLSL里在计算镜面光的时候多加一个
判断:
//镜面反射算法
if (difusefactor>0.0f) //只有有光照到的地方才有镜面反射!!!
{
float3 DirectionToView = normalize(worldpos.xyz - g_ViewPos.xyz); //(同在世界空间中!)
float3 VectorToLight = normalize(input.vtpos.xyz - g_PLs[i].Position.xyz);
//计算反射光
float3 reflectanceRay = 2 * dot(input.normal.xyz, VectorToLight.xyz)*input.normal.xyz - VectorToLight.xyz;
float specfactor = pow(abs(dot(reflectanceRay, DirectionToView)), g_PLs[i].RangeAttenuation.z);
//镜面光累加
specular.xyz += g_PLs[i].Specular.xyz * specfactor;//最后要乘以材质的吸取系数(这里没乘)
} 框架
(下面的效果图都没有修改这一个错误,自行修改)
测试二: 两个点光源:
测试三: 方向光:
测试四:聚光灯:
测试五:火力全开:
(亮瞎眼了~...)
函数
测试