Program: 156490
Project: 156490
Buggy source:
static void renderPowerPipe(Pipe<PipeTransportPower> pipe,double x,double y,double z){
  PipeTransportPower pow=pipe.transport;
  GL11.glPushMatrix();
  GL11.glPushAttrib(GL11.GL_ENABLE_BIT);
  GlStateManager.disableLighting();
  GL11.glDisable(GL11.GL_LIGHTING);
  GL11.glTranslatef((float)x,(float)y,(float)z);
  Minecraft.getMinecraft().getTextureManager().bindTexture(TextureMap.locationBlocksTexture);
  short centerPower=0;
  short[] power=pow.displayPower;
  short[] flow=pow.displayFlow;
  for (int i=0; i < 6; i++) {
    short d=power[i];
    if (d > centerPower) {
      centerPower=d;
    }
  }
  if (centerPower > 0) {
    long ms=System.currentTimeMillis();
    long diff=ms - pow.clientLastDisplayTime;
    if (pow.clientLastDisplayTime == 0 || diff <= 0) {
      diff=1;
    }
    pow.clientLastDisplayTime=ms;
    for (int i=0; i < 6; i++) {
      EnumFacing face=EnumFacing.values()[i];
      if (!pipe.getTile().isPipeConnected(face)) {
        continue;
      }
      double actualDiff=flow[i] * diff * FLOW_MULTIPLIER;
      double connectionDiff=face.getAxisDirection() == AxisDirection.POSITIVE ? actualDiff : -actualDiff;
      pow.clientDisplayFlow[i]+=connectionDiff;
      while (pow.clientDisplayFlow[i] < 0) {
        pow.clientDisplayFlow[i]+=16;
      }
      while (pow.clientDisplayFlow[i] > 16) {
        pow.clientDisplayFlow[i]-=16;
      }
      pow.clientDisplayFlowCentre=pow.clientDisplayFlowCentre.add(Utils.convert(face,actualDiff / 2));
      renderSidePower(face,power[i],pow.clientDisplayFlow[i],centerPower);
    }
    for (    Axis axis : Axis.values()) {
      double value=Utils.getValue(pow.clientDisplayFlowCentre,axis);
      while (value < 0) {
        value+=16;
      }
      while (value > 16) {
        value-=16;
      }
      pow.clientDisplayFlowCentre=Utils.withValue(pow.clientDisplayFlowCentre,axis,value);
    }
    renderCenterPower(centerPower,pow.clientDisplayFlowCentre);
  }
  GlStateManager.enableLighting();
  GL11.glPopAttrib();
  GL11.glPopMatrix();
}

Fixed version (ground truth):
static void renderPowerPipe(Pipe<PipeTransportPower> pipe,double x,double y,double z){
  PipeTransportPower pow=pipe.transport;
  GL11.glPushMatrix();
  GL11.glPushAttrib(GL11.GL_ENABLE_BIT);
  GlStateManager.disableLighting();
  GL11.glTranslatef((float)x,(float)y,(float)z);
  Minecraft.getMinecraft().getTextureManager().bindTexture(TextureMap.locationBlocksTexture);
  short centerPower=0;
  short[] power=pow.displayPower;
  short[] flow=pow.displayFlow;
  for (int i=0; i < 6; i++) {
    short d=power[i];
    if (d > centerPower) {
      centerPower=d;
    }
  }
  if (centerPower > 0) {
    long ms=System.currentTimeMillis();
    long diff=ms - pow.clientLastDisplayTime;
    if (pow.clientLastDisplayTime == 0 || diff <= 0) {
      diff=1;
    }
    pow.clientLastDisplayTime=ms;
    for (int i=0; i < 6; i++) {
      EnumFacing face=EnumFacing.values()[i];
      if (!pipe.getTile().isPipeConnected(face)) {
        continue;
      }
      double actualDiff=flow[i] * diff * FLOW_MULTIPLIER;
      double connectionDiff=face.getAxisDirection() == AxisDirection.POSITIVE ? actualDiff : -actualDiff;
      pow.clientDisplayFlow[i]+=connectionDiff;
      while (pow.clientDisplayFlow[i] < 0) {
        pow.clientDisplayFlow[i]+=16;
      }
      while (pow.clientDisplayFlow[i] > 16) {
        pow.clientDisplayFlow[i]-=16;
      }
      pow.clientDisplayFlowCentre=pow.clientDisplayFlowCentre.add(Utils.convert(face,actualDiff / 2));
      renderSidePower(face,power[i],pow.clientDisplayFlow[i],centerPower);
    }
    for (    Axis axis : Axis.values()) {
      double value=Utils.getValue(pow.clientDisplayFlowCentre,axis);
      while (value < 0) {
        value+=16;
      }
      while (value > 16) {
        value-=16;
      }
      pow.clientDisplayFlowCentre=Utils.withValue(pow.clientDisplayFlowCentre,axis,value);
    }
    renderCenterPower(centerPower,pow.clientDisplayFlowCentre);
  }
  GlStateManager.enableLighting();
  GL11.glPopAttrib();
  GL11.glPopMatrix();
}