BuildMeshTangents() error in semisphere mesh
Posted: Mon Oct 27, 2025 8:40 pm
Some body cam explain me, why cant apply BuildMeshTangents() to this semisphere mesh? 
Code: Select all
CreateMesh(mesh)
; vértices de la cúpula (la del trueno no, otra..)
For i = 0 To latSteps
theta = (i / latSteps) * (#PI / 2)
For j = 0 To lonSteps
phi = (j / lonSteps) * 2 * #PI
x = ra * Sin(theta) * Cos(phi)
y = ra * Cos(theta)
z = ra * Sin(theta) * Sin(phi)
u = phi / (2 * #PI)
v = theta / (#PI / 2)
MeshVertex(x,y,z, u,v, $ffffff)
Next
Next
; caras (triánguladas)
For i = 0 To latSteps - 1
For j = 0 To lonSteps - 1
p0 = i * (lonSteps + 1) + j
p1 = p0 + 1
p2 = p0 + (lonSteps + 1)
p3 = p2 + 1
; Triángulo 1
MeshFace(p1,p2,p0)
; Triángulo 2
MeshFace(p3,p2,p1)
Next
Next
If tapa
; vértice central inferior
MeshVertex(0, 0, 0, 0.5, 0.5, $ffffff)
; triángulos de la tapa inferior con vértices nuevos y UV planar para que se vea como debe ser
nv = (latSteps+1)*(lonSteps+1)
centerIndex=nv
nv+1
theta.f = #PI / 2
For j = 0 To lonSteps - 1
phi = (j / lonSteps) * 2 * #PI
x = ra * Sin(theta) * Cos(phi)
z = ra * Sin(theta) * Sin(phi)
u = (-x / (2 * ra)) + 0.5
v = (z / (2 * ra)) + 0.5
MeshVertex(x, 0, z, u, v, $ffffff)
p0 = nv
nv+1
; más triángulos jeje
phi = ((j + 1) / lonSteps) * 2 * #PI
x = ra * Sin(theta) * Cos(phi)
z = ra * Sin(theta) * Sin(phi)
u = (-x / (2 * ra)) + 0.5
v = (z / (2 * ra)) + 0.5
MeshVertex(x, 0, z, u, v, $ffffff)
p1 = nv
nv+1
MeshFace(p0, p1, centerIndex)
Next
EndIf
FinishMesh(#True)
NormalizeMesh(mesh)
; BuildMeshTangents(mesh)
