Holy shit!

I fixed it, the stride when sending the vertex buffer was wrong!

Thanks for all your help!

While testing the terrain shader after a while, the normals aren't being calculated normally, and I don't see why they shouldn't.

Or maybe I'm just stupid... Yeah it has to be that...

Terrain Shader:

cbuffer ConstantObjectBuffer : register (b0)
{
	matrix worldMatrix;
};

cbuffer ConstantFrameBuffer : register (b1)
{
	matrix viewMatrix;
	matrix projectionMatrix;

	float3 eyepos;
	float cppad;

	float4 lightvec;
	float4 lightcol;

	float FogStart;
	float FogEnd;
	float2 __space;

	float3 FogColor;
	float shadows;

	float SpecularIntensity;
	float3 pad3;
	float4 SpecularColor;
}


//***************************************************//
//                 VERTEX SHADER                     //
//***************************************************//

struct VOut
{
    float4 position : POSITION;
	float2 texcoord : TEXCOORD;
	float access : ACCESS;

	float tessAmount : TSSAM;
	
	float3 NormalW : NORMWORLD;
	float3 normal : NORM;
	float4 depthPosition : TEXTURE0;
};

struct GlobalIn
{
	float4 position : POSITION;
	float4 normal : NORMAL;
	float2 texcoord : TEXCOORD;
};

Texture2D t_map : register(t0);
Texture2D t_slope_flat  : register(t1);
Texture2D t_slope_slope : register(t2);
Texture2D t_slope_steep : register(t3);
SamplerState ss;

VOut VShader(GlobalIn input)
{
    VOut output;

    input.position.w = 1.0f;
	output.texcoord = input.texcoord;

	// Calculate the position of the vertex against the world, view, and projection matrices.
    /*output.position = mul(input.position, worldMatrix);
    output.position = mul(output.position, viewMatrix);
    output.position = mul(output.position, projectionMatrix);*/

	output.position = mul(input.position, viewMatrix);

	// Get Tesselation amount
	output.tessAmount = (1.0f/length(output.position + eyepos)) * 512 + 16.0f;

	output.position = input.position;

    output.NormalW = mul(float4(input.normal.xyz,0), mul(worldMatrix, viewMatrix));

	// Store the position value in a second input value for depth value calculations.
	output.depthPosition.xyz = mul(float4(input.position.xyz,1), mul(worldMatrix, viewMatrix)).xyz;
	output.depthPosition.w = 1.0f;

	// Per Vertex lighting
	float4 norm = normalize(input.normal);
	output.access = saturate(dot(norm, lightvec));

	output.normal = input.normal;
	
    return output;
}

//***************************************************//
//                 HULL SHADER                       //
//***************************************************//

struct HOutput
{
    float edges[3] : SV_TessFactor;
    float inside : SV_InsideTessFactor;
};

HOutput ColorPatchConstantFunction(InputPatch<VOut, 3> inputPatch, uint patchId : SV_PrimitiveID)
{    
    HOutput output;

	float tA = inputPatch[0].tessAmount;
	//tA = 36.0f;

    // Set the tessellation factors for the three edges of the triangle.
    output.edges[0] = tA;
    output.edges[1] = tA;
    output.edges[2] = tA;

    // Set the tessellation factor for tessallating inside the triangle.
    output.inside = tA;

    return output;
}

[domain("tri")]
[partitioning("integer")]
[outputtopology("triangle_cw")]
[outputcontrolpoints(3)]
[patchconstantfunc("ColorPatchConstantFunction")]

VOut HShader(InputPatch<VOut, 3> patch, uint pointId : SV_OutputControlPointID, uint patchId : SV_PrimitiveID)
{
    VOut output;

    // Set the x for this control point as the output x.
    output.position =      patch[pointId].position;
    output.texcoord =      patch[pointId].texcoord;
    output.depthPosition = patch[pointId].depthPosition;
    output.access =        patch[pointId].access;
    output.tessAmount =    patch[pointId].tessAmount;
    output.NormalW =       patch[pointId].NormalW;
    output.normal =        patch[pointId].normal;

    return output;
}

//***************************************************//
//                 DOMAIN SHADER                     //
//***************************************************//

struct DOut
{
    float4 position : SV_Position;
	float2 texcoord : TEXCOORD;
	float access : ACCESS;

	float tessAmount : TSSAM;
	
	float3 NormalW : NORMWORLD;
	float4 depthPosition : TEXTURE0;
};

[domain("tri")]

DOut DShader(HOutput input, float3 uvwCoord : SV_DomainLocation, const OutputPatch<VOut, 3> patch)
{
    DOut output;

	float3 vertexPosition;
    float2 texCoords;
    float3 normal;
    float4 worldPosition;

	output.texcoord = patch[0].texcoord;
	output.depthPosition = patch[0].depthPosition;

	vertexPosition = uvwCoord.x * patch[0].position + uvwCoord.y * patch[1].position + uvwCoord.z * patch[2].position;

    texCoords = uvwCoord.x * patch[0].texcoord + uvwCoord.y * patch[1].texcoord + uvwCoord.z * patch[2].texcoord;

    normal =  uvwCoord.x * patch[0].normal + uvwCoord.y * patch[1].normal + uvwCoord.z * patch[2].normal;
    normal = normalize(normal);

    float vHeight = t_map.SampleLevel(ss, texCoords, 0);
    vertexPosition += normal * (vHeight * 25.0f);

    output.position = mul(float4(vertexPosition, 1.0f), worldMatrix);
    output.position = mul(output.position, viewMatrix);
    output.position = mul(output.position, projectionMatrix);

    output.texcoord = texCoords;

    output.NormalW = normal;//mul(normal ,(float3x3)worldMatrix);
    output.NormalW = normalize(output.NormalW);

	output.NormalW = normal;

	output.tessAmount = patch[0].tessAmount;
	
	output.access = dot(output.NormalW, lightvec);

    return output;
}

//***************************************************//
//                 GEOMETRY SHADER                   //
//***************************************************//

[maxvertexcount(3)]   // produce a maximum of 3 output vertices
void GShader( triangle DOut input[3], inout TriangleStream<DOut> triStream )
{
  DOut psInput;
  
  for( uint i = 0; i < 3; i++ )
  {
    psInput.position = input[i].position;
    psInput.texcoord = input[i].texcoord;
    psInput.access = input[i].access;
    psInput.access = input[i].access;
    psInput.NormalW = input[i].NormalW;
    psInput.depthPosition = input[i].depthPosition;
    psInput.tessAmount = input[i].tessAmount;

    triStream.Append(psInput);
  }

  triStream.RestartStrip();
}

//***************************************************//
//                 PIXEL SHADER                      //
//***************************************************//

struct POut
{
	float4 Diffuse  : SV_Target0;
	float4 Position : SV_Target1;
	float4 Depth    : SV_Target2;
	float4 Normals  : SV_Target3;
	float4 Lighting : SV_Target4;
};

POut PShader(DOut input)
{
	POut output;

	// Depth
	output.Depth = float4(input.depthPosition.xyz, 1.0f);

	// Normals
	output.Normals = float4(normalize(input.NormalW), 1);

	output.Position = float4(1, 1, 1, 1);

	float li = saturate(dot(input.NormalW, -lightvec));

	output.Diffuse = float4(input.NormalW, 1);

	/*
	// Sample the grass color from the texture using the sampler at this texture coordinate location.
    grassColor = grassTexture.Sample(SampleType, input.tex);

    // Sample the slope color from the texture using the sampler at this texture coordinate location.
    slopeColor = slopeTexture.Sample(SampleType, input.tex);

    // Sample the rock color from the texture using the sampler at this texture coordinate location.
    rockColor = rockTexture.Sample(SampleType, input.tex);

    // Calculate the slope of this point.
    slope = 1.0f - input.normal.y;

    // Determine which texture to use based on height.
    if(slope < 0.2)
    {
        blendAmount = slope / 0.2f;
        textureColor = lerp(grassColor, slopeColor, blendAmount);
    }
	
    if((slope < 0.7) && (slope >= 0.2f))
    {
        blendAmount = (slope - 0.2f) * (1.0f / (0.7f - 0.2f));
        textureColor = lerp(slopeColor, rockColor, blendAmount);
    }

    if(slope >= 0.7) 
    {
        textureColor = rockColor;
    }*/
	
	output.Lighting = float4(lightcol.rgb * saturate(dot(input.NormalW, lightvec)), 1.0f);

	return output;
}