So I recently decompiled a mod to see how it rendered the arm in the first person with an item in hand. This is the code I came up with, deobfuscated to the best of my ability. I used bytecode viewer to decompile if that helps. I need to know the unknown fields in the code

 

public void renderFirstPersonArm() {
		Minecraft mc = Minecraft.getMinecraft();
		Render render = mc.getRenderManager().getEntityRenderObject(mc.thePlayer);
		RenderPlayer renderplayer = (RenderPlayer) render;
		GlStateManager.func_179094_E();
		GlStateManager.rotate(42.0F, 0.0F, 1.0F, 0.0F);
		GlStateManager.rotate(-80.0F, 0.0F, 0.0F, 1.0F);
		GlStateManager.rotate(100.0F, 1.0F, 0.0F, 0.0F);
		GlStateManager.func_179109_b(-0.13F, -0.24F, 0.64F);
		GlStateManager.func_179152_a(0.8F, 0.8F, 1.2F);
		if ((mc.field_71439_g.field_82175_bq) && (mc.field_71439_g.field_110158_av >= 1)) {
			GlStateManager.rotate(60.0F, 0.0F, 1.0F, 0.0F);
			GlStateManager.rotate(-10.0F, 0.0F, 0.0F, 1.0F);
			GlStateManager.rotate(-5.0F, 1.0F, 0.0F, 0.0F);
			GlStateManager.func_179109_b(0.6F, 0.0F, 0.0F);
		}

		ResourceLocation skin = Minecraft.getMinecraft().thePlayer.getLocationSkin();
		Minecraft.getMinecraft().renderEngine.bindTexture(skin);
		renderplayer.renderRightArm(mc.thePlayer);
		Minecraft.getMinecraft().renderEngine.bindTexture(TextureMap.LOCATION_BLOCKS_TEXTURE);
		GlStateManager.func_179121_F();
		if ((mc.field_71439_g.func_70694_bm() != null)
				&& (mc.field_71439_g.func_70694_bm().func_77973_b() == AmnesiaLights.LanternOff)) {
			GlStateManager.func_179094_E();
			GlStateManager.rotate(15.0F, 0.0F, 1.0F, 0.0F);
			GlStateManager.rotate(-88.0F, 0.0F, 0.0F, 1.0F);
			GlStateManager.func_179109_b(-0.12F, -0.75F, 0.12F);
			GlStateManager.func_179152_a(0.8F, 1.2F, 0.8F);
			Minecraft.func_71410_x().func_110434_K()
					.func_110577_a(Minecraft.func_71410_x().field_71439_g.func_110306_p());
			renderplayer.func_177138_b(mc.field_71439_g);
			Minecraft.func_71410_x().func_110434_K().func_110577_a(TextureMap.field_110575_b);
			GlStateManager.func_179121_F();
		}
	}

 

This is the original code of obfuscated functions, again if it helps

public void renderFirstPersonArm()
{
	Minecraft mc = Minecraft.func_71410_x();
     Render render = mc.func_175598_ae().func_78713_a(mc.field_71439_g);
     RenderPlayer renderplayer = (RenderPlayer)render;
     GlStateManager.func_179094_E();
     GlStateManager.func_179114_b(42.0F, 0.0F, 1.0F, 0.0F);
     GlStateManager.func_179114_b(-80.0F, 0.0F, 0.0F, 1.0F);
     GlStateManager.func_179114_b(100.0F, 1.0F, 0.0F, 0.0F);
     GlStateManager.func_179109_b(-0.13F, -0.24F, 0.64F);
     GlStateManager.func_179152_a(0.8F, 0.8F, 1.2F);
     if ((mc.field_71439_g.field_82175_bq) && 
       (mc.field_71439_g.field_110158_av >= 1)) {
       GlStateManager.func_179114_b(60.0F, 0.0F, 1.0F, 0.0F);
       GlStateManager.func_179114_b(-10.0F, 0.0F, 0.0F, 1.0F);
       GlStateManager.func_179114_b(-5.0F, 1.0F, 0.0F, 0.0F);
       GlStateManager.func_179109_b(0.6F, 0.0F, 0.0F);
     }
     
     ResourceLocation skin = Minecraft.func_71410_x().field_71439_g.func_110306_p();
     Minecraft.func_71410_x().func_110434_K().func_110577_a(skin);
     renderplayer.func_177138_b(mc.field_71439_g);
     Minecraft.func_71410_x().func_110434_K().func_110577_a(TextureMap.field_110575_b);
     GlStateManager.func_179121_F();
     if ((mc.field_71439_g.func_70694_bm() != null) && (mc.field_71439_g.func_70694_bm().func_77973_b() == AmnesiaLights.LanternOff)) {
       GlStateManager.func_179094_E();
       GlStateManager.func_179114_b(15.0F, 0.0F, 1.0F, 0.0F);
       GlStateManager.func_179114_b(-88.0F, 0.0F, 0.0F, 1.0F);
       GlStateManager.func_179109_b(-0.12F, -0.75F, 0.12F);
       GlStateManager.func_179152_a(0.8F, 1.2F, 0.8F);
       Minecraft.func_71410_x().func_110434_K().func_110577_a(Minecraft.func_71410_x().field_71439_g.func_110306_p());
       renderplayer.func_177138_b(mc.field_71439_g);
       Minecraft.func_71410_x().func_110434_K().func_110577_a(TextureMap.field_110575_b);
       GlStateManager.func_179121_F();
     }
   }

 

Edited October 31, 20186 yr by Nick82285
Grammar

Didn't I tell you already in your other topic to look at how vanilla renders it's player arm in ItemRenderer#renderArmFirstPerson? I bet their code isn't much different from vanilla's.

 

If I were to guess then:

21 minutes ago, Nick82285 said:

GlStateManager.func_179094_E();

This is likely pushMatrix

 

21 minutes ago, Nick82285 said:

GlStateManager.func_179109_b(-0.13F, -0.24F, 0.64F);

This is likely translate

 

21 minutes ago, Nick82285 said:

GlStateManager.func_179152_a(0.8F, 0.8F, 1.2F);

This is likely scale

 

21 minutes ago, Nick82285 said:

GlStateManager.func_179121_F();

This is likely popMatrix

 

21 minutes ago, Nick82285 said:

mc.field_71439_g

This looks like Minecraft.player

 

21 minutes ago, Nick82285 said:

field_82175_bq

EntityLivingBase.isSwingInProgress?

 

21 minutes ago, Nick82285 said:

field_110158_av

If the previous assumption is correct then this must be EntityLivingBase.swingProgressInt

 

21 minutes ago, Nick82285 said:

mc.field_71439_g.func_70694_bm()

Something like mc.player.getHeldItemMainhand()

 

21 minutes ago, Nick82285 said:

mc.field_71439_g.func_70694_bm().func_77973_b()

mc.player.getHeldItemMainhand().getItem()

 

21 minutes ago, Nick82285 said:

Minecraft.func_71410_x().func_110434_K() .func_110577_a(Minecraft.func_71410_x().field_71439_g.func_110306_p());

Minecraft.getMinecraft().getTextureManager().bindTexture(Minecraft.getMinecraft().player.getLocationSkin());

 

21 minutes ago, Nick82285 said:

renderplayer.func_177138_b(mc.field_71439_g);

renderplayer.renderRightArm(mc.player);

 

21 minutes ago, Nick82285 said:

Minecraft.func_71410_x().func_110434_K().func_110577_a(TextureMap.field_110575_b);

Minecraft.getMinecraft().getTextureManager().bindTexture(TextureMap.LOCATION_BLOCKS_TEXTURE);

 

You could have used MCPBot or the mappings stored on your PC yourself to get these, SRG names don't really change between versions unless the method/field is deleted completely.

Also I think this is slightly illegal since you are planning to use this code in your mod and not decompiling for educational purposes. Well maybe not illegal but certainly not a nice thing to do. You should've asked the mod author for their code. 

4 minutes ago, V0idWa1k3r said:

Also I think this is slightly illegal since you are planning to use this code in your mod and not decompiling for educational purposes.

Sure thing, you're right, I contacted him on the MinecraftForum to see if he's okay with it. He has stopped developing his mod at 1.8.9 and he hasn't seemed to be online for a while, but I'm willing to wait.

 

Appreciate the help