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This extension draws 3d objects from a Wavefront .obj 3D file stored in a local folder
Many settings for appearance, lighting, rotation, etc are available.
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IMAGE PLANE SCENE|
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Vertices are given as "v" followed by three numbers (x,y,z).
All files need a vertex list
v x.xxx y.yyy z.zzz
Faces are given by a list of vertices
(vertex 1 is the first in the list above, 2 the second, etc):
f 1 2 3
Edges are given by a list of vertices. These will be broken down
into adjacent pairs automatically.
l 1 2 3
Faces are rendered according to the painter's algorithm and perhaps
back-face culling, if selected. The parameter to sort the faces by
is user-selectable between max, min and average z-value of the vertices
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�r1_axr �r1_ang�r2_ax�r2_ang�r3_ax�r3_ang�r4_ang�r5_ang�r6_ang)�optionsr r r �make_rotation_log| s: � ��� ��� ��� ��� �rX c C s t t�| | ��}t�| �| S )zEreturn the unit vector pointing in the same direction as the argument)r �numpy�dot�array)�vector�lengthr r r � normalise� s r^ c C s` t �t �| |d d �t �| |d d � t �| |d d �t �| |d d � ��� S )zRnormal vector for the plane passing though the first three elements of face of ptsr r+ r9 )rY �crossr[ �flatten�r3 r4 r r r �
get_normal� s **��rb c C s |rdnd}|t t| |�� S )z}
Returns the unit normal for the plane passing through the
first three points of face, taking account of winding
���r+ )r^ rb )r3 r4 �cw_wound�windingr r r �get_unit_normal� s rf c C s� |dkr t �g d�dt|�t|� gdt|�t|�gg�}n;|dkr<t �t|�dt|�gg d�t|� dt|�gg�}n |dkrYt �t|�t|� dgt|�t|�dgg d�g�}t �|| �S )z)choose the correct rotation matrix to use�x)r+ r r r �y)r r+ r �z)r r r+ )rY r[ r r �matmul)�matrix�rads�axis� trans_matr r r �rotate� s (�(�(� ro c @ s e Zd Zdd� ZdS )�Stylec C sJ |j | _ d| _d| _d| _t|jd �| _t|jd �| _d| _d| _d S )Nz#ff0000r r9 � Y@r ) r, r �colr r r/ r. �linecapr- )�selfrW r r r �__init__� s
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� d S )4Nz--tab�object)�defaultz--obj�cubez --spec_filezgreat_rhombicuboct.objz
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