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Reflection effect = problem

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Hi everybody,

I would like to create a reflection effect to display later this reflection on the water but I have a problem. I create my reflection texture (seen from below but it don't have the clipping plane but that's not the problem), I have a plan that represent the water, it's 100px * 100px size and applied my texture on this plan but I get this:


My shader code:

Texture2D reflection:register(t5);
SamplerState s:register(s0);
cbuffer ConstantBuffer:register(b1){
Matrix mFull;
Matrix mFullReflection;
float4 lightDirection;
float4 ambientColor;
float4 diffuseColor;
float2 sizePlane;
struct VSin {
float3 pos: POSITION;
float3 normal: NORMAL;
struct VSout {
float4 pos: SV_POSITION;
float4 reflectionPosition : TEXCOORD;
float3 normal: NORMAL;

struct PSin {
float4 position : SV_POSITION;
float4 reflectionPosition : TEXCOORD;
float3 normal : NORMAL;
VSout VSmain( VSin Vin) {
VSout Vout = (VSout)0;
Vout.pos = mul(float4(Vin.pos,1), mFull );
Vout.reflectionPosition = mul(float4(Vin.pos,1), mFullReflection );
return Vout;
float4 PSmain( PSin Pin ) : SV_Target {
float4 reflectionColor;
float2 reflectTexCoord;
reflectTexCoord.x = Pin.reflectionPosition.x / Pin.reflectionPosition.w / 2.0f + 0.5f;
reflectTexCoord.y = -Pin.reflectionPosition.y / Pin.reflectionPosition.w / 2.0f + 0.5f;
reflectionColor = reflection.Sample(s, reflectTexCoord);

return reflectionColor;

My fonction to create the plane:

bool Plane::initBuffers(ID3D11Device* p_device){
D3DXVECTOR3 v1,v2,v3,v4,v5,v6;
D3DXVECTOR3 n,n1,n2,n3,n4,n5,n6;
int index=0;

m_nbVertex = 4;
m_nbIndices = 6;
m_nbFaces = 2;
m_vertex = new Vertex_T[m_nbVertex];
m_indices= new UINT[m_nbIndices];


m_indices[index++] = 0;
m_indices[index++] = 1;
m_indices[index++]= 3;
m_indices[index++] = 0;
m_indices[index++] = 3;
m_indices[index++] = 2;

//vertex buffer
D3D11_BUFFER_DESC BufDescVertex = { m_nbVertex *sizeof(Vertex_T), D3D11_USAGE_DEFAULT, D3D11_BIND_VERTEX_BUFFER, 0,0,0 };
D3D11_SUBRESOURCE_DATA BufDataVertex = { m_vertex, 0, 0 };
res=p_device->CreateBuffer(&BufDescVertex, &BufDataVertex, &m_vertexBuffer);
return false;
// index buffer
D3D11_BUFFER_DESC BufDescIndex = { m_nbIndices*sizeof(UINT), D3D11_USAGE_DEFAULT,D3D11_BIND_INDEX_BUFFER, 0,0,0 };
D3D11_SUBRESOURCE_DATA BufDataIndex = { m_indices, 0, 0 };
res=p_device->CreateBuffer(&BufDescIndex, &BufDataIndex, &m_indexBuffer);
return false;
return true;

Thx for your help.

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The image must be projected in image space. If you don't mirror the camera, you must mirror the result. Let the clipping show a little bit extra to hide artifacts from waves.

This code sample using my own engine shows how simplified reflection and refraction works on a high level.

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