Phong normal for *any* position on poly?

[Helper]

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 02/01/2009 at 14:19, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   10.1 
Platform:   Windows  ; Mac  ;  
Language(s) :     C++  ;

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Hi,

using barycentric coordinates, I get random positions on the polygons of an object. Now I'd like to get the Phong normals for all these positions.

I know, I can use CreatePhongnormals to get the Phong normals of all polygons, but that only gives me one Phong normal for each polygon, right? So how can I get a nice normal for every position *on* a polygon?

Thanks for any help

Greetings,
Jack

[Helper]

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 02/01/2009 at 19:44, xxxxxxxx wrote:

Howdy,

The CreatePhongNormals() function gives you an array of the normals at each point of each polygon (4*GetPolygonCount()). You use this along with the barycentric coordinates to interpolate the normal at the point on each triangular part of a quad.

For the interpolated phong normal at a given point on a triangle I use this:

> \> phongN = !(vertNormA \* bryCrd.x + vertNormB \* bryCrd.y + vertNormC \* bryCrd.z); \>

Adios,
Cactus Dan

[Helper]

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 03/01/2009 at 03:38, xxxxxxxx wrote:

Ah! Great! Thanks again, Dan!
Now I can do what I want

Greetings,
Jack