Hello. I'm trying to rotate other entities (not my custom entities - I don't have access to their model/render classes to do this with easily) to be upside down. I have found several posts about similar topics, but none that I found had a valid solution or had been closed before a solution was posted.

 

Currently, I'm able to rotate an entity properly, but the entity then moves along the y-axis incorrectly as the player moves (note: the polar bear is on top of the glass block):

 

Here is my current code: 

@SubscribeEvent
@SideOnly(Side.CLIENT)
public void rotateEntities(RenderLivingEvent.Pre<EntityLivingBase> event) {
    if (/*should this entity be rotated*/) {
        GlStateManager.pushMatrix();
        GlStateManager.rotate(180f, 0, 0, 0);
        GlStateManager.rotate(180f, 0, 1, 0);
    }
}

@SubscribeEvent
@SideOnly(Side.CLIENT)
public void rotateEntities(RenderLivingEvent.Post<EntityLivingBase> event) {
    if (/*should this entity be rotated*/) {
        GlStateManager.popMatrix();
    }
}

 

If anyone knows how to fix this y-axis movement (i.e. a translation) or how to properly rotate the entity so this doesn't happen, please let me know. Thanks ahead of time!

Edited September 20, 20178 yr by Furgl

After some experimenting, I found that a simple translation fixes it:

@SubscribeEvent
@SideOnly(Side.CLIENT)
public void rotateEntities(RenderLivingEvent.Pre<EntityLivingBase> event) {
    if (/*should this entity be rotated*/) {
        GlStateManager.pushMatrix();
        GlStateManager.translate(0.0F, event.getY()*2f+event.getEntity().height, 0.0F);      
        GlStateManager.rotate(180f, 0, 0, 0);
        GlStateManager.rotate(180f, 0, 1, 0);
    }
}

@SubscribeEvent
@SideOnly(Side.CLIENT)
public void rotateEntities(RenderLivingEvent.Post<EntityLivingBase> event) {
    if (/*should this entity be rotated*/) {
        GlStateManager.popMatrix();
    }
}

 

As mentioned previously...