Designing Games with Game Maker - YoYo Games

d3d_light_define_direction(ind,dx,dy,dz,col) Defines a directed
light. ind is the index of the light (use a small positive number). (dx,dy,dz) is
the direction of the light. col is the color of the light (often you want to use
c_white. This function does not turn the light on.
d3d_light_define_point(ind,x,y,z,range,col) Defines a point light.
ind is the index of the light use a small positive number). (x,y,z) is the
position of the light. range indicates till how far the light shines. The intensity
of the light will decrease over this range. col is the color of the light. This
function does not turn the light on.
d3d_light_enable(ind,enable) Enables (true) or disables (false) light
number ind.
The way an object reflects light depends on the angle between the light direction and the
normal of the surface, that is, the vector pointing away from the surface. Hence, to create
lighted objects you need not only provide the position of the vertices but also their normals.
For this four additional functions are avaliable to define the vertices of primitives:
d3d_vertex_normal(x,y,z,nx,ny,nz) Add vertex (x,y,z) to the primitive,
with normal vector (nx,ny,nz).
d3d_vertex_normal_color(x,y,z,nx,ny,nz,col,alpha) Add vertex
(x,y,z) to the primitive, with normal vector (nx,ny,nz), and with its own color
and alpha value.
d3d_vertex_normal_texture(x,y,z,nx,ny,nz,xtex,ytex) Add vertex
(x,y,z) to the primitive, with normal vector (nx,ny,nz), and with position
(xtex,ytex) in the texture, blending with the color and alpha value set before.
d3d_vertex_normal_texture_color(x,y,z,nx,ny,nz,xtex,ytex,co
l,alpha) Add vertex (x,y,z) to the primitive, with normal vector (nx,ny,nz),
and with position (xtex,ytex) in the texture, blending with its own color and
alpha value.
Note that for the basic shapes that you can draw the normals are automatically set correctly.
Creating models