Question Cannot create struct expecting float3 with float3(0.,0.,0.)

I am porting a cloud shader with horizon to Unity for use in an AR app.

I am stuck trying to get the declaration of a struct to work properly.

Shader is here: https://www.shadertoy.com/view/XtBXDw

In the preliminary declarations there are these:

Code (CSharp):

1.  
2. struct sphere_t {
3.     float3 origin;
4.     float radius;
5.     int material;
6. };
7.  
8. struct plane_t {
9.     float3 direction;
10.     float distance;
11.     int material;
12. };
13.  
14. struct hit_t {
15.     float t;
16.     int material_id;
17.     float3 normal;
18.     float3 origin;
19. };

But when the final calculations that use these are declared:

Code (CSharp):

1.  
2.             sphere_t atmosphere
3.             { float3(0., -450, 0.), 500., 0}
4.  
5.             sphere_t atmosphere_2
6.             {
7.                atmosphere.origin, atmosphere.radius + 50., 0
8.             }
9.             plane_t ground
10.             {
11.                 float3(0., -1., 0.), 0., 1
12.             }

I get an error for the first instance of an open bracket after the first float3.

Shader error in 'Unlit/horizon-clouds': syntax error: unexpected token '(' at line 547 (on metal)

I can't even test this shader until this is resolved. Am I wrong to assume this is really the only way to initialize the struct values?

 

struct_type variable_name = { val0, val1, etc };