目前我正在从这些教程中学习DirectX 11： http://www.rastertek.com/tutdx11.html
教程工作正常，所以我在我的小引擎中实现了这些东西。问题是，directx不会在所有多边形上渲染漫反射光，并且光的方向似乎是错误的。
以下是具有两个多边形的渲染平面的图片： https://www.dropbox.com/s/9m94n1q7oichi2b/DX11Plane.PNG
以下是源代码的一些部分：
//The vertex structure
struct BE_SVERTEX{
BE_SVERTEX(){
}
BE_SVERTEX(D3DXVECTOR3 position, D3DXVECTOR2 texture, D3DXVECTOR3 normal){
this->position = position;
this->texture = texture;
this->normal = normal;
}
BE_SVERTEX(const BE_SVERTEX &v){
this->normal = v.normal;
this->position = v.position;
this->texture = v.texture;
}
D3DXVECTOR3 position;
D3DXVECTOR2 texture;
D3DXVECTOR3 normal;
};
这里我创建了顶点和索引缓冲区：
aVertices = new BE_SVERTEX[vVertices.size()];
aIndices = new unsigned long[vIndices.size()];
//Filling the vertex and index array with the data from the wavefront file
for (int i = 0; i < vVertices.size(); i++){
//To test the normalvector of the plane i have set the normalvectors from all vertices of the plane manually
aVertices[i].normal = D3DXVECTOR3{ 0.0f, 0.0f, -1.0f};
aVertices[i].position = vVertices[i].position;
aVertices[i].texture = vVertices[i].texture;
//The indices for the index buffer. Currently the index buffer is unnecessary because the engine creates for each polygon 3 new vertices.
aIndices[i] = vIndices[i];
}
//Creating the vertex buffer
vertexBufferDesc.Usage = D3D11_USAGE_DEFAULT;
vertexBufferDesc.ByteWidth = sizeof(BE_SVERTEX) * vVertices.size();
vertexBufferDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
vertexBufferDesc.CPUAccessFlags = 0;
vertexBufferDesc.MiscFlags = 0;
vertexBufferDesc.StructureByteStride = 0;
vertexData.pSysMem = aVertices;
vertexData.SysMemPitch = 0;
vertexData.SysMemSlicePitch = 0;
mesh->vertexBuffer = NULL;
result = device->CreateBuffer(&vertexBufferDesc, &vertexData, &mesh->vertexBuffer);
if (FAILED(result)){
return BE_SRESULT{ 7, false };
}
else{
//Creating the index buffer
indexBufferDesc.Usage = D3D11_USAGE_DEFAULT;
indexBufferDesc.ByteWidth = sizeof(unsigned long) * vIndices.size();
indexBufferDesc.BindFlags = D3D11_BIND_INDEX_BUFFER;
indexBufferDesc.CPUAccessFlags = 0;
indexBufferDesc.MiscFlags = 0;
indexBufferDesc.StructureByteStride = 0;
indexData.pSysMem = aIndices;
indexData.SysMemPitch = 0;
indexData.SysMemSlicePitch = 0;
mesh->indexBuffer = NULL;
result = device->CreateBuffer(&indexBufferDesc, &indexData, &mesh- >indexBuffer);
if (FAILED(result)){
return BE_SRESULT{ 7, false };
}
着色器创建的某些部分：
//Creating the input layout
polygonLayout[0].SemanticName = "POSITION";
polygonLayout[0].SemanticIndex = 0;
polygonLayout[0].Format = DXGI_FORMAT_R32G32B32_FLOAT;
polygonLayout[0].InputSlot = 0;
polygonLayout[0].AlignedByteOffset = 0;
polygonLayout[0].InputSlotClass = D3D11_INPUT_PER_VERTEX_DATA;
polygonLayout[0].InstanceDataStepRate = 0;
polygonLayout[1].SemanticName = "TEXCOORD";
polygonLayout[1].SemanticIndex = 0;
polygonLayout[1].Format = DXGI_FORMAT_R32G32B32_FLOAT;
polygonLayout[1].InputSlot = 0;
polygonLayout[1].AlignedByteOffset = D3D11_APPEND_ALIGNED_ELEMENT;
polygonLayout[1].InputSlotClass = D3D11_INPUT_PER_VERTEX_DATA;
polygonLayout[1].InstanceDataStepRate = 0;
polygonLayout[2].SemanticName = "NORMAL";
polygonLayout[2].SemanticIndex = 0;
polygonLayout[2].Format = DXGI_FORMAT_R32G32B32_FLOAT;
polygonLayout[2].InputSlot = 0;
polygonLayout[2].AlignedByteOffset = D3D11_APPEND_ALIGNED_ELEMENT;
polygonLayout[2].InputSlotClass = D3D11_INPUT_PER_VERTEX_DATA;
polygonLayout[2].InstanceDataStepRate = 0;
numElements = sizeof(polygonLayout) / sizeof(polygonLayout[0]);
result = device->CreateInputLayout(polygonLayout, numElements, vertexShaderBuffer->GetBufferPointer(), vertexShaderBuffer->GetBufferSize(), &layout);
着色器的渲染功能：
//Setting rendering settings. This methode is called every frame before shader rendering.
BE_SRESULT ObjectElements::BE_OE_Shader::setShaderParameters(D3DXMATRIX worldMatrix, D3DXMATRIX viewMatrix, D3DXMATRIX projectionMatrix, ID3D11ShaderResourceView *texture, D3DXVECTOR3 lightDirection, D3DXVECTOR4 diffuseColor){
HRESULT result;
D3D11_MAPPED_SUBRESOURCE mappedResource;
unsigned int bufferNumber;
MatrixBufferType *dataPtr;
LightBufferType *dataPtr2;
D3DXMatrixTranspose(&worldMatrix, &worldMatrix);
D3DXMatrixTranspose(&viewMatrix, &viewMatrix);
D3DXMatrixTranspose(&projectionMatrix, &projectionMatrix);
result = immediateDevice->Map(matrixBuffer, 0, D3D11_MAP_WRITE_DISCARD, 0, &mappedResource);
if (FAILED(result)){
return BE_SRESULT{ 8, false };
}
else{
dataPtr = (MatrixBufferType*)mappedResource.pData;
dataPtr->world = worldMatrix;
dataPtr->view = viewMatrix;
dataPtr->projection = projectionMatrix;
immediateDevice->Unmap(matrixBuffer, 0);
bufferNumber = 0;
immediateDevice->VSSetConstantBuffers(bufferNumber, 1, &matrixBuffer);
immediateDevice->PSSetShaderResources(0, 1, &texture);
result = immediateDevice->Map(lightBuffer, 0, D3D11_MAP_WRITE_DISCARD, 0, &mappedResource);
if (FAILED(result)){
return BE_SRESULT{ 8, false };
}
else{
dataPtr2 = (LightBufferType*)mappedResource.pData;
dataPtr2->diffuseColor = diffuseColor;
dataPtr2->lightDirection = lightDirection;
dataPtr2->padding = 0.0f;
immediateDevice->Unmap(lightBuffer, 0);
bufferNumber = 0;
immediateDevice->PSSetConstantBuffers(bufferNumber, 1, &lightBuffer);
return BE_SRESULT{ 0, true };
}
}
}
//The render function of the shader
void ObjectElements::BE_OE_Shader::render(int indexCount){
immediateDevice->IASetInputLayout(layout);
immediateDevice->VSSetShader(vertexShader, NULL, 0);
immediateDevice->PSSetShader(pixelShader, NULL, 0);
immediateDevice->PSSetSamplers(0, 1, &sampleState);
immediateDevice->DrawIndexed(indexCount, 0, 0);
}
光线方向为D3DXVECTOR3 {0.0f，0.0f，1.0f}。
我已经搜索了几个小时才发现故障，但灯仍然无法正常工作。我使用的着色器与教程中的着色器相同。
我希望有人可以帮助我。
答案 0 :(得分：0)
顶点缓冲区包含一个根据BE_SVERTEX的float2 uv，但是输入布局声明了一个float3，并且由于你使用了自动偏移，所以法线被错误地偏移了。
此
polygonLayout[1].Format = DXGI_FORMAT_R32G32B32_FLOAT;
成为
polygonLayout[1].Format = DXGI_FORMAT_R32G32_FLOAT;