## aidl/mountain/mountain4

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    from AIDL import *

    def mountain(base_width: float = 10*inches, height: float = 8*inches, snow_height: float = 2*inches):
        """
        Creates a simple mountain model. The mountain is a large triangle
        with snow caps on the top represented by smaller triangles.
        """

        # Define the mountain structure
        mountain = Solid()

        # Define the main body of the mountain as a triangle
        mountain.base = Triangle((0, 0), base_width, height)

        # Define the snow cap structure
        snow_caps = Drawing()
        mountain.snow_caps = snow_caps

        # Create snow caps at the top of the mountain
        snow_caps.left_snow = Triangle((-(base_width/4), height - snow_height/2), base_width/2, snow_height)
        snow_caps.right_snow = Triangle((base_width/4, height - snow_height/2), base_width/2, snow_height)

        # Local constraints for snow caps to align with the mountain body
        mountain.AddConstraint(Coincident(snow_caps.left_snow.top_corner, mountain.base.top_corner))
        mountain.AddConstraint(Coincident(snow_caps.right_snow.top_corner, mountain.base.top_corner))

        # Make the snow caps symmetric horizontally around the top of the mountain
        mountain.AddConstraint(HorizontallySymmetric(snow_caps.left_snow.left_corner, snow_caps.left_snow.right_corner))
        mountain.AddConstraint(HorizontallySymmetric(snow_caps.right_snow.left_corner, snow_caps.right_snow.right_corner))

        return mountain

    with AIDL_2D:
        model = mountain()
    print(model.Solve())
    model.Render()
                    Please write an AIDL program to generate a mountain

    Sure! Let's begin by defining the structure and main features for a mountain in AIDL. For this example, we can create a simplified representation of a mountain with a triangular shape and some snow caps at the top.

    Here's the plan:
    1. Create the main mountain structure using a triangle.
    2. Add some snow cap details using smaller white triangles at the top.

    I'll start by writing the function definition and the basic structure. We can then refine it based on additional requirements.

    ```python
    from AIDL import *

    def mountain(base_width: float = 10*inches, height: float = 8*inches, snow_height: float = 2*inches):
        """
        Creates a simple mountain model. The mountain is a large triangle
        with snow caps on the top represented by smaller triangles.
        """

        # Define the mountain structure
        mountain = Solid()

        # Define the main body of the mountain as a triangle
        mountain.base = Triangle((0, 0), base_width, height)

        # Define the snow cap structure
        snow_caps = Drawing()
        mountain.snow_caps = snow_caps

        # Create snow caps at the top of the mountain
        snow_caps.left_snow = Triangle((-(base_width/4), height - snow_height/2), base_width/2, snow_height)
        snow_caps.right_snow = Triangle((base_width/4, height - snow_height/2), base_width/2, snow_height)

        # Local constraints for snow caps to align with the mountain body
        mountain.AddConstraint(Coincident(snow_caps.left_snow.top_corner, mountain.base.top_corner))
        mountain.AddConstraint(Coincident(snow_caps.right_snow.top_corner, mountain.base.top_corner))
        mountain.AddConstraint(HorizontallySymmetric(snow_caps.left_snow.bottom_left, snow_caps.left_snow.bottom_right))
        mountain.AddConstraint(HorizontallySymmetric(snow_caps.right_snow.bottom_left, snow_caps.right_snow.bottom_right))

        return mountain

    with AIDL_2D:
        model = mountain()
    print(model.Solve())
    model.Render()
    ```

    ### Explanation:

    1. **Function Definition**:
       - `base_width`: The width of the base of the mountain.
       - `height`: The height of the mountain.
       - `snow_height`: The height of the snow caps at the top of the mountain.

    2. **Mountain Structure**:
       - A `Solid` structure named `mountain`.
       - `mountain.base`: Defines the main body of the mountain with a `Triangle`.

    3. **Snow Caps**:
       - A `Drawing` structure named `snow_caps` to represent the snow caps.
       - `left_snow` and `right_snow`: Smaller triangles positioned at the top of the mountain to simulate snow caps.

    4. **Constraints**:
       - `Coincident` constraints are used to align the snow cap triangles with the top corner of the main mountain triangle.
       - `HorizontallySymmetric` constraints ensure the symmetry of the snow cap triangles.

    This is a basic representation of a mountain with snow caps. If you have additional features or details you want to include, please let me know, and we can refine this further.

    Traceback (most recent call last):
      File "/net/projects/ranalab/jz/aidl/AIDL/generation/backend.py", line 21, in dumbrun
        exec(code, env)
      File "", line 33, in
      File "", line 27, in mountain
    AttributeError: 'Triangle' object has no attribute 'bottom_left'

    It looks like there was a small error in the attribute references for the `Triangle` objects. The `bottom_left`, `bottom_right`, etc., attributes do not exist for `Triangle` objects. The correct attributes for a `Triangle` object should be `left_corner`, `right_corner`, and `top_corner`.

    Let's correct these references and adjust the constraints accordingly. Here’s the updated version:

    ```python
    from AIDL import *

    def mountain(base_width: float = 10*inches, height: float = 8*inches, snow_height: float = 2*inches):
        """
        Creates a simple mountain model. The mountain is a large triangle
        with snow caps on the top represented by smaller triangles.
        """

        # Define the mountain structure
        mountain = Solid()

        # Define the main body of the mountain as a triangle
        mountain.base = Triangle((0, 0), base_width, height)

        # Define the snow cap structure
        snow_caps = Drawing()
        mountain.snow_caps = snow_caps

        # Create snow caps at the top of the mountain
        snow_caps.left_snow = Triangle((-(base_width/4), height - snow_height/2), base_width/2, snow_height)
        snow_caps.right_snow = Triangle((base_width/4, height - snow_height/2), base_width/2, snow_height)

        # Local constraints for snow caps to align with the mountain body
        mountain.AddConstraint(Coincident(snow_caps.left_snow.top_corner, mountain.base.top_corner))
        mountain.AddConstraint(Coincident(snow_caps.right_snow.top_corner, mountain.base.top_corner))

        # Make the snow caps symmetric horizontally around the top of the mountain
        mountain.AddConstraint(HorizontallySymmetric(snow_caps.left_snow.left_corner, snow_caps.left_snow.right_corner))
        mountain.AddConstraint(HorizontallySymmetric(snow_caps.right_snow.left_corner, snow_caps.right_snow.right_corner))

        return mountain

    with AIDL_2D:
        model = mountain()
    print(model.Solve())
    model.Render()
    ```

    ### Explanation:

    1. **Updated Attribute References**:
       - Replaced `bottom_left`, `bottom_right`, etc., with correct attributes for a `Triangle` object like `left_corner`, `right_corner`.

    2. **Constraints**:
       - Corrected the constraints to use these correct attributes.

    This should resolve the error and properly generate the mountain model with snow caps. If you have any further requirements or additional features to add, please let me know!