AC3D Forums - View Single Post - Surfaces are black and I dont know why :/

maineman · 28th October 2022, 12:58 AM

from the manual

"Change vertex order"

This changes the order in which the vertices of a surface are drawn, by moving the first vertex to the end of the vertex list. This can be used to change the position of a break in a line. It can also be used to fix a bad polygon, which has the first three vertices in a non anti-clockwise order - causing the normal (used for lighting) to be incorrectly calculated. If a polygon appears all black, this function may need executing (possibly repeatedly) until it appears correctly."

and

"It is possible to combine surfaces that do not lie on the same plane. It is recommended that the vertices be flattened in order to make them lie on the
same plane.

If after combining surfaces, the new surface appears black from every angle, this means that the first three vertices of the surface form an angle of more than 180
degrees. To prevent this, the vertex order must be changed (Surface->Change Vertex Order) so that the first three vertices of the surface form an angle less than 180 degrees."

28th October 2022, 12:58 AM	#4
maineman Junior Member Junior member Join Date: Apr 2021 Posts: 8	Re: Surfaces are black and I dont know why :/ from the manual "Change vertex order" This changes the order in which the vertices of a surface are drawn, by moving the first vertex to the end of the vertex list. This can be used to change the position of a break in a line. It can also be used to fix a bad polygon, which has the first three vertices in a non anti-clockwise order - causing the normal (used for lighting) to be incorrectly calculated. If a polygon appears all black, this function may need executing (possibly repeatedly) until it appears correctly." and "It is possible to combine surfaces that do not lie on the same plane. It is recommended that the vertices be flattened in order to make them lie on the same plane. If after combining surfaces, the new surface appears black from every angle, this means that the first three vertices of the surface form an angle of more than 180 degrees. To prevent this, the vertex order must be changed (Surface->Change Vertex Order) so that the first three vertices of the surface form an angle less than 180 degrees."