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GL11.glRotated code not working correctly


memcallen

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I've made a turbine block that looks like a windmill. It's supposed to run off of steam blocks that I've added, but it doesn't rotate correctly.

 

 

My TESR class:

package com.example.gammacraft.blockRenderers;

import org.lwjgl.opengl.GL11;

import com.example.gammacraft.TileEntity.SteamTurbineTileEntity;

import assets.gammacraft.textures.models.SteamTurbineModel;
import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.tileentity.TileEntitySpecialRenderer;
import net.minecraft.entity.Entity;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.ResourceLocation;

public class SteamTurbineRenderer extends TileEntitySpecialRenderer {

SteamTurbineModel model;

public SteamTurbineRenderer() {
	model = new SteamTurbineModel();
}

@Override
public void renderTileEntityAt(TileEntity tile, double x, double y,double z, float scale) {
	int dir = tile.getWorldObj().getBlockMetadata(tile.xCoord, tile.yCoord, tile.zCoord);
	SteamTurbineTileEntity te = (SteamTurbineTileEntity)tile.getWorldObj().getTileEntity(tile.xCoord, tile.yCoord, tile.zCoord);

	GL11.glPushMatrix();

	GL11.glTranslated(x+0.5F, y+0.5F, z);

	GL11.glRotated(te.getRotation(), 0, 0, 1);

	System.out.println(te.getRotation());

	GL11.glDisable(GL11.GL_LIGHTING);

	this.bindTexture(new ResourceLocation("gammacraft:textures/blocks/Candle.png"));

	this.model.render((Entity)null, 0.0F, 0.0F, -0.1F, 0.0F, 0.0F, 0.0625F);

	GL11.glPopMatrix();


}

 

My TileEntity  (I will  add the packets later):

package com.example.gammacraft.TileEntity;

import net.minecraft.tileentity.TileEntity;

public class SteamTurbineTileEntity extends TileEntity {

public int Speed = 0;
public float rotation = 0;

public SteamTurbineTileEntity() {
	// TODO Auto-generated constructor stub
}

public void setRotation(float rot){
	this.rotation = rot;
}
public float getRotation(){
	return this.rotation;
}

public void setSpeed(int Speed){
	this.Speed = Speed;
}
public int getSpeed(){
	return this.Speed;
}

}

 

And my block class:

package com.example.gammacraft.blocks.energy;

import java.util.Random;

import com.example.gammacraft.gammacraft;
import com.example.gammacraft.TileEntity.SteamTurbineTileEntity;

import net.minecraft.block.Block;
import net.minecraft.block.BlockPistonBase;
import net.minecraft.block.ITileEntityProvider;
import net.minecraft.block.material.Material;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.ItemStack;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.world.World;

public class SteamTurbine extends Block implements ITileEntityProvider {

public SteamTurbine() {
	super(Material.iron);
	this.setCreativeTab(gammacraft.gammacraftcreativetab);
	this.setBlockName("SteamTurbine");
}

public void onNeighborBlockChange(World world, int x, int y, int z, Block block){
	SteamTurbineTileEntity te = (SteamTurbineTileEntity)world.getTileEntity(x, y, z);

	if(world.getBlock(x, y-1, z)==gammacraft.SteamBlock)te.Speed=5;


	world.scheduleBlockUpdate(x, y, z, (Block)this, 1);
}

public void updateTick(World world,int x,int y,int z,Random random){
	SteamTurbineTileEntity te = (SteamTurbineTileEntity)world.getTileEntity(x, y, z);

	te.setRotation(te.getRotation()+te.getSpeed());



	if(world.getBlock(x, y-1, z)!=gammacraft.SteamBlock){
	if(te.Speed>0){
		te.Speed--;
	}
	if(te.Speed<0){
		te.Speed++;
	}
	}else{
		if(te.Speed>0){
			te.Speed++;
		}
		if(te.Speed<0){
			te.Speed--;
		}
	}

	System.out.println(te.Speed);

	if(te.Speed!=0)
	world.scheduleBlockUpdate(x, y, z, (Block)this, 2);
}

@Override
public boolean onBlockActivated(World world, int x, int y, int z, EntityPlayer player, int side, float Hitx, float Hity, float Hitz) {
	if(player.getHeldItem()!=null){
		if(player.getHeldItem().getItem()==gammacraft.wrench){
			if(side!=0||side!=1){
				world.setBlockMetadataWithNotify(x, y, z, side-2, 0);
				System.out.println(side);
			}
			return true;
		}
	}
	return false;

}

@Override
public TileEntity createNewTileEntity(World var1, int var2) {
	return new SteamTurbineTileEntity();
}

@Override
public boolean isOpaqueCube(){
	return false;
}
@Override
    public int getRenderType() {
            return -1;
    }
 public boolean renderAsNormalBlock() {
         return false;
    }

}

The proud(ish) developer of Ancients

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I am using the metadata, I think the first post has a different trial than what I was doing (I'm using metadata*90 for the rotation).

Thanks, I wasn't sure what the last float was for, I've never seen any uses for it in any tutorials.

The proud(ish) developer of Ancients

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Hi

 

It looks to me like your placement rotation is about right, but you are rotating around the wrong centrepoint.

In order to fix that, you need to do

GL11.glTranslatef(dX, dY, dZ);
glRotate
GL11.glTranslatef(-dX, -dY, -dZ);

where dX, dY and dZ are the translation you need to make your turbine rotate around its centrepoint.  You should be able to find that out from the program you used to make your model, alternatively trial and error will show you pretty quickly.

 

the final float that you've labelled 'scale' is actually partialTick.  Kind of like Brandon said, it's related to the time since the last tick.  It helps you make smoother animations.

 

For example, if you're drawing a spinning wheel using the code

rotationPositionInDegrees = degreesPerTick * numberOfTicks

and in your tileentity you have a field integerTickCount, which gets incremented every tick, for example in onUpdate(),

then if you just use

numberOfTicks = integerTickCount

you will get jerky animation with at most 20 frames per second.

Instead, if you use

numberOfTicks = integerTickCount + partialTickCount

your animation will be much smoother because you get 'partial' ticks between the integer values.  If your game is running at say 60 frames per second this looks much nicer.

 

-TGG

 

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