For my CarEntity i need a method that lets the entity go up blocks. For that i need to know wether the block at the wheels is solid or liquid and if there is a block above it. How can i do that?

The block at the wheels, I understand you mean under the wheel, I think you can use Block.isNormalCube and check if block is water still or running, for that?

 

Now the problem is you say you need to check if it has 1 block above it, which wont be true as your wheel is above it.

 

I imagine you first need to determine the direction the car is going and check 1 block above the previous block in that direction?

Ok, I'm not even sure what the previous post was trying to say.

 

'entity.getPosition' will give you where it is now.  I assume you know how to shift up (.up())

 

Anyhow, several things to look at that could easily work for your work.  There is another few methods in world for is block solid on a side.

 

    this.worldObj.isAirBlock(pos);

    this.worldObj.getBlockState(pos).getBlock().getMaterial()

 

 

 

 

What i need is the Block at the front part, so the car can go up at the front and drive on.