I’m attempting a geometry shader that will output a pyramid for every triangle in. It kind of works, but it seems to be creating additional unexpected geometry which is causing z-fighting and worse. Here is my GS

``````[maxvertexcount(12)](maxvertexcount(12))
void GS(triangle VS_OUTPUT input[3](3), inout TriangleStream<VS_OUTPUT> gsout)
{
VS_OUTPUT elem = (VS_OUTPUT)0;
elem.pos.w=1.0;

float3 p1 = input[0](0).pos.xyz;
float3 p2 = input[1](1).pos.xyz;
float3 p3 = input[2](2).pos.xyz;

float3 ce = (p1+p2+p3)/3.0f;

float3 ceNew = float3(20,0,-0);

float amt = distance(ceNew, ce);

float3 faceEdgeA = p2 - p1;
float3 faceEdgeB = p1 - p3;
float3 norm = cross(faceEdgeB, faceEdgeA);
norm = normalize(norm);
float3 apex = ce +(height*norm);

//floor
elem.pos.xyz = input[0](0).pos.xyz+(norm*amt);
elem.norm = norm;
elem.uv = input[0](0).uv;
gsout.Append(elem);

elem.pos.xyz = input[1](1).pos.xyz+(norm*amt);
elem.norm = norm;
elem.uv = input[1](1).uv;
gsout.Append(elem);

elem.pos.xyz = input[2](2).pos.xyz+(norm*amt);
elem.norm = norm;
elem.uv = input[2](2).uv;
gsout.Append(elem);

gsout.RestartStrip();

//side 1

faceEdgeA = p2-p1;
faceEdgeB = p1-apex;
float3 face1Norm = cross(faceEdgeB, faceEdgeA);
face1Norm =normalize(face1Norm);

elem.pos.xyz = input[0](0).pos.xyz+(norm*amt);
elem.norm = face1Norm;
elem.uv = input[0](0).uv;
gsout.Append(elem);

elem.pos.xyz = input[1](1).pos.xyz+(norm*amt);
elem.norm = face1Norm;
elem.uv = input[1](1).uv;
gsout.Append(elem);

elem.pos.xyz = apex+(norm*amt);
elem.norm = face1Norm;
elem.uv = input[0](0).uv;
gsout.Append(elem);

gsout.RestartStrip();

//side2

faceEdgeA = p3-p2;
faceEdgeB = p2-apex;
float3 face2Norm = cross(faceEdgeB, faceEdgeA);
face2Norm =normalize(face2Norm);

elem.pos.xyz = input[1](1).pos.xyz+(norm*amt);
elem.norm = face2Norm;
elem.uv = input[1](1).uv;
gsout.Append(elem);

elem.pos.xyz = input[2](2).pos.xyz+(norm*amt);
elem.norm = face2Norm;
elem.uv = input[2](2).uv;
gsout.Append(elem);

elem.pos.xyz = apex+(norm*amt);
elem.norm = face2Norm;
elem.uv = input[0](0).uv;
gsout.Append(elem);

gsout.RestartStrip();

//side3

faceEdgeA = p1-p3;
faceEdgeB = p3-apex;
float3 face3Norm = cross(faceEdgeB, faceEdgeA);
face3Norm =normalize(face3Norm);

elem.pos.xyz = input[2](2).pos.xyz+(norm*amt);
elem.norm = face3Norm;
elem.uv = input[2](2).uv;
gsout.Append(elem);

elem.pos.xyz = input[0](0).pos.xyz+(norm*amt);
elem.norm = face3Norm;
elem.uv = input[0](0).uv;
gsout.Append(elem);

elem.pos.xyz = apex+(norm*amt);
elem.norm = face3Norm;
elem.uv = input[0](0).uv;
gsout.Append(elem);

gsout.RestartStrip();
}``````