Using the illfamed try-and-error technique I have finally managed to render
a planet with night shadow (screen snaps attached). Now, since a planet
rotates around its axis while seasons change the center of the shadow
needs to be positioned accordingly.
Googled for it but couldn't find anything that deals with the same problem.
I would truly appreciate help from anyone familiar with OpenGL
The core source:
a planet with night shadow (screen snaps attached). Now, since a planet
rotates around its axis while seasons change the center of the shadow
needs to be positioned accordingly.
Googled for it but couldn't find anything that deals with the same problem.
I would truly appreciate help from anyone familiar with OpenGL
The core source:
B4X:
Sub Globals
Dim lightDiffuse(0),lightPositionOn(0), lightPositionOff(0) As Float
lightDiffuse = Array As Float(0.9,0.9,0.9,1)
lightPositionOn = Array As Float(0,0,0,1)
lightPositionOff = Array As Float(1,1,1,0)
Dim globalAmbient(0) As Float
globalAmbient = Array As Float(0.3,0.3,0.3,0.7)
End Sub
Sub glsv_Draw(gl As GL1)
gl.glClearColor(0.0,0.0,0,1)
gl.glClear(Bit.Or(gl.GL_COLOR_BUFFER_BIT, gl.GL_DEPTH_BUFFER_BIT))
gl.glLoadIdentity
gl.glScalef(0.5,0.5,0.5)
gl.glTranslatef(0,0,-distZ)
gl.glRotatef(rotX,1,0,0)
gl.glRotatef(rotY,0,1,0)
gl.glRotatef(rotZ,0,0,1)
gl.glShadeModel(gl.GL_SMOOTH)
gl.glLightfv(gl.GL_LIGHT0,gl.GL_AMBIENT,globalAmbient,0)
gl.glLightfv(gl.GL_LIGHT0,gl.GL_DIFFUSE,lightDiffuse,0)
If shadow Then
gl.glLightfv(gl.GL_LIGHT0,gl.GL_POSITION,lightPositionOn,0)
Else
gl.glLightfv(gl.GL_LIGHT0,gl.GL_POSITION,lightPositionOff,0)
End If
gl.glEnable(gl.GL_LIGHTING)
gl.glEnable(gl.GL_LIGHT0)
GLObject_Draw(obj1,gl)
End Sub
Sub glsv_SurfaceCreated(gl As GL1)
gl.glClearDepthf(1.0)
gl.glEnable(gl.GL_DEPTH_TEST)
gl.glDepthFunc(gl.GL_LEQUAL)
gl.glHint(gl.GL_PERSPECTIVE_CORRECTION_HINT,gl.GL_NICEST)
gl.glFrontFace(gl.GL_CCW) : gl.glEnable(gl.GL_CULL_FACE) : gl.glCullFace(gl.GL_BACK)
glsv.RequestRender
End Sub
Sub glsv_SurfaceChanged(gl As GL1, width As Int, height As Int)
gl.glViewport(0, 0, width, height)
gl.glMatrixMode(gl.GL_PROJECTION)
gl.glLoadIdentity
gl.gluPerspective(fov,width/height,1,100)
gl.glMatrixMode(gl.GL_MODELVIEW)
End Sub
