Program: 165615
Project: 165615
Buggy source:
public ModuleRaytraceResult getHitModule(double hitX,double hitY,double hitZ,EnumFacing side,EnumFacing horizontalFacing){
  ModuleRaytraceResult result;
  float factor=size + 1.0f;
  float dx=0, dy=0;
switch (side) {
case NORTH:
    dx=(float)((1.0 - hitX) / factor);
  dy=(float)((1.0 - hitY) / factor);
break;
case SOUTH:
dx=(float)(hitX / factor);
dy=(float)((1.0 - hitY) / factor);
break;
case WEST:
dx=(float)(hitZ / factor);
dy=(float)((1.0 - hitY) / factor);
break;
case EAST:
dx=(float)((1.0 - hitZ) / factor);
dy=(float)((1.0 - hitY) / factor);
break;
case UP:
switch (horizontalFacing) {
case NORTH:
dx=(float)((1.0 - hitX) / factor);
dy=(float)((1.0 - hitZ) / factor);
break;
case SOUTH:
dx=(float)(hitX / factor);
dy=(float)(hitZ / factor);
break;
case WEST:
dx=(float)(hitZ / factor);
dy=(float)((1.0 - hitX) / factor);
break;
case EAST:
dx=(float)((1.0 - hitZ) / factor);
dy=(float)(hitX / factor);
}
break;
case DOWN:
switch (horizontalFacing) {
case NORTH:
dx=(float)((1.0 - hitX) / factor);
dy=(float)(hitZ / factor);
break;
case SOUTH:
dx=(float)(hitX / factor);
dy=(float)((1.0 - hitZ) / factor);
break;
case WEST:
dx=(float)(hitZ / factor);
dy=(float)(hitX / factor);
break;
case EAST:
dx=(float)((1.0 - hitZ) / factor);
dy=(float)((1.0 - hitX) / factor);
}
break;
default :
return null;
}
int x=(int)(dx * 128);
int y=(int)(dy * 128);
int currenty=7;
int moduleIndex=0;
List<IClientScreenModule> clientScreenModules=getClientScreenModules();
for (IClientScreenModule module : clientScreenModules) {
if (module != null) {
int height=module.getHeight();
if (currenty + height <= 124) {
if (currenty <= y && y < (currenty + height)) {
break;
}
currenty+=height;
}
}
moduleIndex++;
}
if (moduleIndex >= clientScreenModules.size()) {
return null;
}
result=new ModuleRaytraceResult(moduleIndex,x,y,currenty);
return result;
}

Fixed version (ground truth):
public ModuleRaytraceResult getHitModule(double hitX,double hitY,double hitZ,EnumFacing side,EnumFacing horizontalFacing){
  ModuleRaytraceResult result;
  float factor=size + 1.0f;
  float dx=0, dy=0;
switch (side) {
case NORTH:
    dx=(float)((1.0 - hitX) / factor);
  dy=(float)((1.0 - hitY) / factor);
break;
case SOUTH:
dx=(float)(hitX / factor);
dy=(float)((1.0 - hitY) / factor);
break;
case WEST:
dx=(float)(hitZ / factor);
dy=(float)((1.0 - hitY) / factor);
break;
case EAST:
dx=(float)((1.0 - hitZ) / factor);
dy=(float)((1.0 - hitY) / factor);
break;
case UP:
switch (horizontalFacing) {
case NORTH:
dx=(float)((1.0 - hitX) / factor);
dy=(float)((1.0 - hitZ) / factor);
break;
case SOUTH:
dx=(float)(hitX / factor);
dy=(float)(hitZ / factor);
break;
case WEST:
dx=(float)(hitZ / factor);
dy=(float)((1.0 - hitX) / factor);
break;
case EAST:
dx=(float)((1.0 - hitZ) / factor);
dy=(float)(hitX / factor);
}
break;
case DOWN:
switch (horizontalFacing) {
case NORTH:
dx=(float)((1.0 - hitX) / factor);
dy=(float)(hitZ / factor);
break;
case SOUTH:
dx=(float)(hitX / factor);
dy=(float)((1.0 - hitZ) / factor);
break;
case WEST:
dx=(float)(hitZ / factor);
dy=(float)(hitX / factor);
break;
case EAST:
dx=(float)((1.0 - hitZ) / factor);
dy=(float)((1.0 - hitX) / factor);
}
break;
default :
return null;
}
int x=(int)(dx * 128);
int y=(int)(dy * 128);
int currenty=7;
int moduleIndex=0;
List<IClientScreenModule<?>> clientScreenModules=getClientScreenModules();
for (IClientScreenModule<?> module : clientScreenModules) {
if (module != null) {
int height=module.getHeight();
if (currenty + height <= 124) {
if (currenty <= y && y < (currenty + height)) {
break;
}
currenty+=height;
}
}
moduleIndex++;
}
if (moduleIndex >= clientScreenModules.size()) {
return null;
}
result=new ModuleRaytraceResult(moduleIndex,x,y,currenty);
return result;
}