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Jun 14th, 2020, 11:54 AM
#121
Thread Starter
PowerPoster
Re: 3D Math: how draw a 3D cube?
SeabrookStan's: i have 2 questions:
1 - how you get\calculate the line coordinates when the vector it's outside the view\camera?
2 - isn't normal draw the plane using triangles?
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Jun 24th, 2020, 04:51 PM
#122
Thread Starter
PowerPoster
Re: 3D Math: how draw a 3D cube?
passel: the DrawPlane is almost done:
Code:
Private Sub DrawPlane(Position As position3D, Size As Size3D, Rotation As Angle3D, WorldSize As Size3D)
Dim Points(4) As POINTAPI
Dim NewPoint As POINTAPI
Dim NewPosition3D(4) As position3D
Dim RotatedPosition As position3D
Dim NewPosition3D2 As position3D
'FillPosition3D RotatedPosition, Position.X + Size.Width / 2, Position.Y + Size.Height / 2, Position.Z + Size.ZDepth / 2
With Player1.Position
FillPosition3D RotatedPosition, .x, .Y, .Z 'Camera Position
End With
If (IsCollision3D(Player1.Position, WorldSize, Position, Size) = False) Then Exit Sub
'Floor:
'Vector1
FillPosition3D NewPosition3D(0), Position.x, Position.Y, Position.Z
NewPosition3D(0) = Rotate(NewPosition3D(0), Rotation, RotatedPosition)
If (IsOnCamera(NewPosition3D(0), camera1.Position, camera1.Size) = False) Then
NewPosition3D(0) = GetInCamVector(NewPosition3D(0), NewPosition3D2)
End If
NewPoint = ConvertPositon3DTo2D(NewPosition3D(0), WorldSize)
Points(0) = NewPoint
'Vector2
FillPosition3D NewPosition3D(1), Position.x, Position.Y, Position.Z + Size.ZDepth
NewPosition3D(1) = Rotate(NewPosition3D(1), Rotation, RotatedPosition)
NewPoint = ConvertPositon3DTo2D(NewPosition3D(1), WorldSize)
Points(1) = NewPoint
'Vector3
FillPosition3D NewPosition3D(2), Position.x + Size.Width, Position.Y, Position.Z + Size.ZDepth
NewPosition3D(2) = Rotate(NewPosition3D(2), Rotation, RotatedPosition)
NewPosition3D2 = NewPosition3D(2)
NewPoint = ConvertPositon3DTo2D(NewPosition3D(2), WorldSize)
Points(2) = NewPoint
'Vector4:
'getting the wrong vector X :(
NewPosition3D(3) = NewPosition3D(0)
NewPosition3D(3).x = NewPosition3D(2).x
NewPoint = ConvertPositon3DTo2D(NewPosition3D(3), WorldSize)
Points(3) = NewPoint
FillStyle = vbFSSolid
FillColor = vbRed
Polygon Me.hDC, Points(0), 4
End Sub
but the vector 4, the position 'X', seems wrong... can you advice me more?
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Jun 24th, 2020, 10:00 PM
#123
Re: 3D Math: how draw a 3D cube?
Position, Size, Rotation and WorldSize values are unknown.
Rotate function doesn't exist.
ConvertPosition3DTo2D doesn't exist.
IsCollision3D function doesn't exist.
IsOnCamera function doesn't exist.
GetInCamVector function doesn't exist.
Nothing compiles. Nothing is testable.
"Anyone can do any amount of work, provided it isn't the work he is supposed to be doing at that moment" Robert Benchley, 1930
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Jun 25th, 2020, 03:22 PM
#124
Thread Starter
PowerPoster
Re: 3D Math: how draw a 3D cube?
i'm using a timer for use the keyboard
arrow\direction keys and the 'W', 'S', 'A' and 'S'
Code:
Option Explicit
'Get Key state:
Const KEY_DOWN As Integer = &H8000
Private Declare Function GetKeyState Lib "user32.dll" (ByVal nVirtKey As KeyCodeConstants) As Integer
'GDI pens and brushes:
Private Declare Function SelectObject Lib "GDI32.dll" ( _
ByVal hDC As Long, ByVal hObject As Long) As Long
Private Declare Function GetDCBrushColor Lib "GDI32.dll" ( _
ByVal hDC As Long) As Long
Private Declare Function SetDCBrushColor Lib "GDI32.dll" ( _
ByVal hDC As Long, ByVal crColor As Long) As Long
Private Declare Function CreateSolidBrush Lib "GDI32.dll" (ByVal crColor As Long) As Long
'Draw array Vertices:
Private Type POINTAPI
x As Long
Y As Long
End Type
Private Declare Function Polygon Lib "gdi32" (ByVal hDC As Long, lpPoint As POINTAPI, ByVal nCount As Long) As Long
Private Enum Coordenates
None
Z
x
Y
End Enum
Private Type position3D
x As Double
Y As Double
Z As Double
End Type
Private Type Angle3D
x As Double
Y As Double
Z As Double
End Type
Private Type Size3D
Width As Double
Height As Double
ZDepth As Double
distance As Double
End Type
Private Type Player
Position As position3D
Movement As position3D
Size As Size3D
Angle As Angle3D
MoveCoordenates As Coordenates
End Type
Private Type Camera
Position As position3D
Size As Size3D
End Type
Private Const Pi As Double = 3.14159265358979
Dim Angletest As Angle3D
Dim Player1 As Player
Dim camera1 As Camera
Private Function IsKeyDown(ByVal nVirtKey As KeyCodeConstants) As Boolean
If GetKeyState(nVirtKey) And KEY_DOWN Then
IsKeyDown = True
Else
IsKeyDown = False
End If
End Function
Private Sub LetPoint3dArray(la() As position3D, ParamArray va() As Variant)
' No error trapping, so use with caution.
Dim i As Long
Dim j As Long
Dim k As Long
k = (UBound(va) + 1) \ 3 - 1
ReDim la(k)
For i = 0& To k
la(i).x = va(j): j = j + 1
la(i).Y = va(j): j = j + 1
la(i).Z = va(j): j = j + 1
Next
End Sub
Private Sub FillPosition2D(Position As POINTAPI, x As Long, Y As Long)
Position.x = x
Position.Y = Y
End Sub
Private Sub FillPosition3D(Position As position3D, x As Double, Y As Double, Z As Double)
Position.x = x
Position.Y = Y
Position.Z = Z
End Sub
Private Sub FillSize3D(Size As Size3D, Width As Double, Height As Double, ZDepth As Double)
Size.Width = Width
Size.Height = Height
Size.ZDepth = ZDepth
End Sub
Private Function GetLinePosition(Origin As position3D, Destiny As position3D, ActualPosition As Double, Optional WhatCoordenate As Coordenates = Z) As position3D
'Getting the AB vector(B-A or Destiny-Origin):
Dim AB As position3D
AB.x = Destiny.x - Origin.x
AB.Y = Destiny.Y - Origin.Y
AB.Z = Destiny.Z - Origin.Z
Dim NewPosition As position3D
Dim T As Double
'depending on player movement(for get 1 coordenate and the T), we get the point coordenate:
If (WhatCoordenate = x) Then
'P.x = O.x + t*AB.x
't = (P.x - O.x) / AB.x
If (AB.x = 0) Then
T = 0
Else
T = (ActualPosition - Origin.x) / AB.x
End If
NewPosition.x = ActualPosition
NewPosition.Y = Origin.Y + AB.Y * T
NewPosition.Z = Origin.Z + AB.Z * T
ElseIf (WhatCoordenate = Y) Then
'P.y = O.y + t*AB.y
't = (P.y - O.y) / AB.y
If (AB.Y = 0) Then
T = 0
Else
T = (ActualPosition - Origin.Y) / AB.Y
End If
NewPosition.Y = ActualPosition
NewPosition.x = Origin.x + AB.x * T
NewPosition.Z = Origin.Z + AB.Z * T
ElseIf (WhatCoordenate = Z) Then
'P.z = O.z + t*AB.z
't = (P.z - O.z) / AB.z
If (AB.Z = 0) Then
T = 0
Else
T = (ActualPosition - Origin.Z) / AB.Z
End If
NewPosition.Z = ActualPosition
NewPosition.x = Origin.x + AB.x * T
NewPosition.Y = Origin.Y + AB.Y * T
End If
GetLinePosition = NewPosition
End Function
Private Function ConvertPositon3DTo2D(Position As position3D, World3DSize As Size3D) As POINTAPI
Dim ConvertedPosition As POINTAPI
Dim PosZZDepth As Long
PosZZDepth = Position.Z + World3DSize.distance
If (PosZZDepth = 0) Then PosZZDepth = 1 'avoiding division by zero
Dim Width As Double
Dim Height As Double
Width = World3DSize.Width / 2
If (Width = 0) Then Width = 0
Height = World3DSize.Height / 2
If (Height = 0) Then Height = 0
ConvertedPosition.x = (Position.x * World3DSize.distance / PosZZDepth) + Width
ConvertedPosition.Y = (Position.Y * World3DSize.distance / PosZZDepth) + Height
ConvertPositon3DTo2D = ConvertedPosition
End Function
Private Function IsOnCamera(VerticePosition As position3D, CameraPosition As position3D, CameraSize As Size3D) As Boolean
If (((VerticePosition.Z) >= CameraPosition.Z) And ((VerticePosition.Z) <= (CameraPosition.Z + CameraSize.ZDepth)) _
And (((VerticePosition.Y) >= CameraPosition.Y) And ((VerticePosition.Y) <= (CameraPosition.Y + CameraSize.Height))) _
And (((VerticePosition.x) >= CameraPosition.x) And ((VerticePosition.x) <= (CameraPosition.x + CameraSize.Width)))) Then
IsOnCamera = True
Else
IsOnCamera = False
End If
End Function
Private Function IsCollision3D(ObjectPosition1 As position3D, ObjectSize1 As Size3D, ObjectPosition2 As position3D, ObjectSize2 As Size3D) As Boolean
IsCollision3D = ((ObjectPosition1.x <= (ObjectPosition2.x + ObjectSize2.Width)) And ((ObjectPosition1.x + ObjectSize1.Width) >= ObjectPosition2.x)) And ((ObjectPosition1.Y <= (ObjectPosition2.Y + ObjectSize2.Height)) And ((ObjectPosition1.Y + ObjectSize1.Height) >= ObjectPosition2.Y)) And ((ObjectPosition1.Z <= (ObjectPosition2.Z + ObjectSize2.ZDepth)) And ((ObjectPosition1.Z + ObjectSize1.ZDepth) >= ObjectPosition2.Z))
End Function
Private Function ConvertDegreesToRadians(Rotation As Angle3D) As Angle3D
Dim deg2Rad As Double
deg2Rad = Pi / 180
ConvertDegreesToRadians.x = Rotation.x * deg2Rad
ConvertDegreesToRadians.Y = Rotation.Y * deg2Rad
ConvertDegreesToRadians.Z = Rotation.Z * deg2Rad
End Function
Private Function Rotate(Position As position3D, Rotation As Angle3D, PositionRotated As position3D) As position3D
Dim ConvertedPosition As position3D
Dim RotationInRads As Angle3D
'Convert degrees to Radians
'Rotation works on Radians
RotationInRads = ConvertDegreesToRadians(Rotation)
'Convert the actual position to zero, using the rotation position:
ConvertedPosition = Position
ConvertedPosition.x = Position.x - PositionRotated.x
ConvertedPosition.Y = -(PositionRotated.Y - Position.Y) 'reversed because Y increments down
ConvertedPosition.Z = Position.Z - PositionRotated.Z
'Rotate the position, but the Z axis must be the 1st:
Dim T As position3D
'Z axis (Roll)
T = ConvertedPosition
ConvertedPosition.x = T.x * Cos(RotationInRads.Z) - T.Y * Sin(RotationInRads.Z)
ConvertedPosition.Y = T.x * Sin(RotationInRads.Z) + T.Y * Cos(RotationInRads.Z)
'X axis (Pitch)
T = ConvertedPosition
ConvertedPosition.Y = T.Y * Cos(RotationInRads.x) - T.Z * Sin(RotationInRads.x)
ConvertedPosition.Z = T.Y * Sin(RotationInRads.x) + T.Z * Cos(RotationInRads.x)
'Y axis (Yaw)
T = ConvertedPosition
ConvertedPosition.x = T.Z * Sin(RotationInRads.Y) + T.x * Cos(RotationInRads.Y)
ConvertedPosition.Z = T.Z * Cos(RotationInRads.Y) - T.x * Sin(RotationInRads.Y)
'Convert to the rotated original position:
ConvertedPosition.x = ConvertedPosition.x + PositionRotated.x
ConvertedPosition.Y = ConvertedPosition.Y + PositionRotated.Y
ConvertedPosition.Z = ConvertedPosition.Z + PositionRotated.Z
'Convert to Camera Coordinates\Position:
'ConvertedPosition.X = ConvertedPosition.X - Player1.Position.X
'ConvertedPosition.Y = ConvertedPosition.Y - Player1.Position.Y
'ConvertedPosition.Z = ConvertedPosition.Z - Player1.Position.Z
Rotate = ConvertedPosition
End Function
Private Sub DrawCube(Position As position3D, Size As Size3D, Rotation As Angle3D, WorldSize As Size3D)
Dim Vertices(11) As POINTAPI
Dim NewPoint As POINTAPI
Dim NewPosition3D As position3D
Dim sized As Size3D
Dim RotatedPosition As position3D
Static FixedPoint0(4) As position3D
'FillPosition3D RotatedPosition, Position.X + Size.Width / 2, Position.Y + Size.Height / 2, Position.Z + Size.ZDepth / 2
With Player1.Position
FillPosition3D RotatedPosition, .x, .Y, .Z 'Camera Position
End With
If (IsOnCamera(NewPosition3D, camera1.Position, camera1.Size) = False) Then Exit Sub
'Floor:
'Vector1
FillPosition3D NewPosition3D, Position.x, Position.Y, Position.Z
NewPosition3D = Rotate(NewPosition3D, Rotation, RotatedPosition)
NewPoint = ConvertPositon3DTo2D(NewPosition3D, WorldSize)
Vertices(0) = NewPoint
'Vector2
FillPosition3D NewPosition3D, Position.x, Position.Y, Position.Z + Size.ZDepth
NewPosition3D = Rotate(NewPosition3D, Rotation, RotatedPosition)
NewPoint = ConvertPositon3DTo2D(NewPosition3D, WorldSize)
Vertices(1) = NewPoint
'Vector3
'FillPosition3D NewPosition3D, 105000, 0, 224000
FillPosition3D NewPosition3D, Position.x + Size.Width, Position.Y, Position.Z + Size.ZDepth
NewPosition3D = Rotate(NewPosition3D, Rotation, RotatedPosition)
NewPoint = ConvertPositon3DTo2D(NewPosition3D, WorldSize)
Vertices(2) = NewPoint
'Vector4
'FillPosition3D NewPosition3D, 105000, 0, 204000
FillPosition3D NewPosition3D, Position.x + Size.Width, Position.Y, Position.Z
NewPosition3D = Rotate(NewPosition3D, Rotation, RotatedPosition)
NewPoint = ConvertPositon3DTo2D(NewPosition3D, WorldSize)
Vertices(3) = NewPoint
'Roof:
'Vector1
'FillPosition3D NewPosition3D, 95000, -6000, 204000
FillPosition3D NewPosition3D, Position.x, Position.Y + Size.Height, Position.Z
NewPosition3D = Rotate(NewPosition3D, Rotation, RotatedPosition)
NewPoint = ConvertPositon3DTo2D(NewPosition3D, WorldSize)
Vertices(4) = NewPoint
'Vector2
'FillPosition3D NewPosition3D, 95000, -6000, 224000
FillPosition3D NewPosition3D, Position.x, Position.Y + Size.Height, Position.Z + Size.ZDepth
NewPosition3D = Rotate(NewPosition3D, Rotation, RotatedPosition)
NewPoint = ConvertPositon3DTo2D(NewPosition3D, WorldSize)
Vertices(5) = NewPoint
'Vector3
'FillPosition3D NewPosition3D, 105000, -6000, 224000
FillPosition3D NewPosition3D, Position.x + Size.Width, Position.Y + Size.Height, Position.Z + Size.ZDepth
NewPosition3D = Rotate(NewPosition3D, Rotation, RotatedPosition)
NewPoint = ConvertPositon3DTo2D(NewPosition3D, WorldSize)
Vertices(6) = NewPoint
'Vector4
'FillPosition3D NewPosition3D, 105000, -6000, 204000
FillPosition3D NewPosition3D, Position.x + Size.Width, Position.Y + Size.Height, Position.Z
NewPosition3D = Rotate(NewPosition3D, Rotation, RotatedPosition)
NewPoint = ConvertPositon3DTo2D(NewPosition3D, WorldSize)
Vertices(7) = NewPoint
'Left:
'Vector1
'FillPosition3D NewPosition3D, 95000, 0, 204000
FillPosition3D NewPosition3D, Position.x, Position.Y, Position.Z
NewPosition3D = Rotate(NewPosition3D, Rotation, RotatedPosition)
NewPoint = ConvertPositon3DTo2D(NewPosition3D, WorldSize)
Vertices(8) = NewPoint
'Vector2
'FillPosition3D NewPosition3D, 95000, -6000, 204000
FillPosition3D NewPosition3D, Position.x, Position.Y + Size.Height, Position.Z
NewPosition3D = Rotate(NewPosition3D, Rotation, RotatedPosition)
NewPoint = ConvertPositon3DTo2D(NewPosition3D, WorldSize)
Vertices(9) = NewPoint
'Vector3
'FillPosition3D NewPosition3D, 95000, -6000, 224000
FillPosition3D NewPosition3D, Position.x, Position.Y + Size.Height, Position.Z + Size.ZDepth
NewPosition3D = Rotate(NewPosition3D, Rotation, RotatedPosition)
NewPoint = ConvertPositon3DTo2D(NewPosition3D, WorldSize)
Vertices(10) = NewPoint
'Vector4
'FillPosition3D NewPosition3D, 95000, 0, 224000
FillPosition3D NewPosition3D, Position.x, Position.Y, Position.Z + Size.ZDepth
NewPosition3D = Rotate(NewPosition3D, Rotation, RotatedPosition)
NewPoint = ConvertPositon3DTo2D(NewPosition3D, WorldSize)
Vertices(11) = NewPoint
'FillStyle = vbFSSolid
'FillColor = vbRed
'If (IsCollisionVertice3D(NewPosition3D, Player1.Position, World3D) = True) Then
Polygon Me.hDC, Vertices(0), 4
'End If
FillColor = vbBlue
'If (IsCollisionVertice3D(NewPosition3D, Player1.Position, World3D) = True) Then
Polygon Me.hDC, Vertices(4), 4
'End If
FillColor = vbGreen
'If (IsCollisionVertice3D(NewPosition3D, Player1.Position, World3D) = True) Then
Polygon Me.hDC, Vertices(8), 4
'End If
End Sub
Private Sub DrawLine(Origin As position3D, Destiny As position3D, Rotation As Angle3D, WorldSize As Size3D)
Dim Points(2) As POINTAPI
Dim NewPosition3D(2) As position3D
Dim RotatedPosition As position3D
With Player1.Position
FillPosition3D RotatedPosition, .x, .Y, .Z 'rotate using camera Position
End With
'Line:
'Calculate Vector1:
FillPosition3D NewPosition3D(0), Origin.x, Origin.Y, Origin.Z
NewPosition3D(0) = Rotate(NewPosition3D(0), Rotation, RotatedPosition)
'Calculate Vector2:
FillPosition3D NewPosition3D(1), Destiny.x, Destiny.Y, Destiny.Z
NewPosition3D(1) = Rotate(NewPosition3D(1), Rotation, RotatedPosition)
'Testing If Vector0 and Vector1 are inside of camera:
If (IsOnCamera(NewPosition3D(0), camera1.Position, camera1.Size) = False And _
IsOnCamera(NewPosition3D(1), camera1.Position, camera1.Size) = False) Then
Exit Sub
End If
If (IsOnCamera(NewPosition3D(0), camera1.Position, camera1.Size) = False) Then
NewPosition3D(0) = GetInCamVector(NewPosition3D(0), NewPosition3D(1))
End If
If (IsOnCamera(NewPosition3D(1), camera1.Position, camera1.Size) = False) Then
NewPosition3D(1) = GetInCamVector(NewPosition3D(1), NewPosition3D(0))
End If
'Convert the Vector1 to 2D:
Points(0) = ConvertPositon3DTo2D(NewPosition3D(0), camera1.Size)
'Convert the Vector2 to 2D:
Points(1) = ConvertPositon3DTo2D(NewPosition3D(1), camera1.Size)
Polygon Me.hDC, Points(0), 2
End Sub
Private Sub DrawPlane(Position As position3D, Size As Size3D, Rotation As Angle3D, WorldSize As Size3D)
Dim Points(4) As POINTAPI
Dim NewPoint As POINTAPI
Dim NewPosition3D(4) As position3D
Dim RotatedPosition As position3D
Dim NewPosition3D2 As position3D
'FillPosition3D RotatedPosition, Position.X + Size.Width / 2, Position.Y + Size.Height / 2, Position.Z + Size.ZDepth / 2
With Player1.Position
FillPosition3D RotatedPosition, .x, .Y, .Z 'Camera Position
End With
If (IsCollision3D(Player1.Position, WorldSize, Position, Size) = False) Then Exit Sub
'Floor:
'Vector1
FillPosition3D NewPosition3D(0), Position.x, Position.Y, Position.Z
NewPosition3D(0) = Rotate(NewPosition3D(0), Rotation, RotatedPosition)
If (IsOnCamera(NewPosition3D(0), camera1.Position, camera1.Size) = False) Then
NewPosition3D(0) = GetInCamVector(NewPosition3D(0), NewPosition3D2)
End If
NewPoint = ConvertPositon3DTo2D(NewPosition3D(0), WorldSize)
Points(0) = NewPoint
'Vector2
FillPosition3D NewPosition3D(1), Position.x, Position.Y, Position.Z + Size.ZDepth
NewPosition3D(1) = Rotate(NewPosition3D(1), Rotation, RotatedPosition)
NewPoint = ConvertPositon3DTo2D(NewPosition3D(1), WorldSize)
Points(1) = NewPoint
'Vector3
FillPosition3D NewPosition3D(2), Position.x + Size.Width, Position.Y, Position.Z + Size.ZDepth
NewPosition3D(2) = Rotate(NewPosition3D(2), Rotation, RotatedPosition)
NewPosition3D2 = NewPosition3D(2)
NewPoint = ConvertPositon3DTo2D(NewPosition3D(2), WorldSize)
Points(2) = NewPoint
'Vector4:
'getting the wrong vector X :(
NewPosition3D(3) = NewPosition3D(0)
NewPosition3D(3).x = NewPosition3D(2).x
NewPoint = ConvertPositon3DTo2D(NewPosition3D(3), WorldSize)
Points(3) = NewPoint
FillStyle = vbFSSolid
FillColor = vbRed
Polygon Me.hDC, Points(0), 4
End Sub
Private Function Ceil(dInput As Double) As Double
' Ceiling, defined as: the smallest integer that is not smaller than x.
' Works for both positive and negative.
Ceil = Int(dInput): If Ceil <> dInput Then Ceil = Ceil + 1#
End Function
Private Function GetInCamVector(Origin As position3D, Destiny As position3D) As position3D
Dim Steps As Double
Steps = Math.Sqr(Math.Abs(Destiny.x - Origin.x) ^ 2 + Math.Abs(Destiny.Y - Origin.Y) ^ 2 + Math.Abs(Destiny.Z - Origin.Z) ^ 2)
Steps = Ceil(Steps)
Dim increment As position3D
increment.x = (Destiny.x - Origin.x) / Steps
increment.Y = (Destiny.Y - Origin.Y) / Steps
increment.Z = (Destiny.Z - Origin.Z) / Steps
Dim nextpoint As position3D
nextpoint = Origin
Dim i As Integer
Dim inter As position3D
Dim Size As Size3D
For i = 1 To Steps
nextpoint.x = nextpoint.x + increment.x
nextpoint.Y = nextpoint.Y + increment.Y
nextpoint.Z = nextpoint.Z + increment.Z
inter.x = Math.Round(nextpoint.x)
inter.Y = Math.Round(nextpoint.Y)
inter.Z = Math.Round(nextpoint.Z)
If (IsOnCamera(inter, camera1.Position, camera1.Size) = True) Then
GetInCamVector = inter
Exit For
End If
Next i
End Function
Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)
If (KeyCode = vbKeyEscape) Then End
End Sub
Private Sub Form_Load()
ScaleMode = vbPixels
AutoRedraw = True
FillPosition3D Player1.Position, Me.ScaleWidth / 2, Me.ScaleHeight / 2, 0 'Camera Position
camera1.Size.Height = Me.ScaleHeight
camera1.Size.Width = Me.ScaleWidth
camera1.Position.x = -Me.ScaleWidth / 2 - 100
camera1.Position.Y = -Me.ScaleHeight / 2 - 100
camera1.Position.Z = 100
camera1.Size.ZDepth = 20000
camera1.Size.distance = 100
ScrollChanged
End Sub
Sub ScrollChanged()
Me.Cls
'Angletest.X = HScroll1.Value
'Angletest.Y = VScroll1.Value
'Angletest.Z = HScroll2.Value
Label1.Caption = Angletest.x & ", " & Angletest.Y & ", " & Angletest.Z
Label1.Caption = Label1.Caption & vbNewLine & Player1.Position.x & ", " & Player1.Position.Y & ", " & Player1.Position.Z
Dim RecPosition As position3D
Dim RecPositiond As position3D
Dim RecSize As Size3D
FillPosition3D RecPosition, Player1.Position.x - 775, Player1.Position.Y, Player1.Position.Z
FillSize3D RecSize, 800, 100, 2000
DrawPlane RecPosition, RecSize, Angletest, camera1.Size
'Line (camera1.Position.x, camera1.Position.Y)-Step(camera1.size.Width, camera1.size.Height), vbBlue, B
Me.Refresh
End Sub
Private Sub Form_Resize()
'ScaleMode = vbPixels
'AutoRedraw = True
FillPosition3D Player1.Position, Me.ScaleWidth / 2, Me.ScaleHeight / 2, 0 'Camera Position
camera1.Size.Height = Me.ScaleHeight + 200
camera1.Size.Width = Me.ScaleWidth
camera1.Position.x = -Me.ScaleWidth / 2
camera1.Position.Y = -Me.ScaleHeight / 2
camera1.Position.Z = -100
camera1.Size.ZDepth = 20000
camera1.Size.distance = 100
ScrollChanged
End Sub
Private Sub Timer1_Timer()
Const Speed As Integer = 10
Player1.MoveCoordenates = None
If IsKeyDown(vbKeyEscape) = True Then
End
End If
If IsKeyDown(vbKeyA) = True Then
Angletest.Y = Angletest.Y + 1
If (Angletest.Y >= 360) Then Angletest.Y = 0
Player1.MoveCoordenates = Y
ScrollChanged
End If
If IsKeyDown(vbKeyD) And KEY_DOWN Then
Angletest.Y = Angletest.Y - 1
If (Angletest.Y <= -360) Then Angletest.Y = 0
Player1.MoveCoordenates = Y
ScrollChanged
End If
If IsKeyDown(vbKeyLeft) And KEY_DOWN Then
Player1.Position.x = Player1.Position.x + Speed
Player1.MoveCoordenates = x
ScrollChanged
End If
If IsKeyDown(vbKeyRight) And KEY_DOWN Then
Player1.Position.x = Player1.Position.x - Speed
Player1.MoveCoordenates = x
ScrollChanged
End If
If IsKeyDown(vbKeyW) And KEY_DOWN Then
Player1.Position.Y = Player1.Position.Y - Speed
Player1.MoveCoordenates = Y
ScrollChanged
End If
If IsKeyDown(vbKeyS) And KEY_DOWN Then
Player1.Position.Y = Player1.Position.Y + Speed
Player1.MoveCoordenates = Y
ScrollChanged
End If
If IsKeyDown(vbKeyUp) And KEY_DOWN Then
Player1.Position.Z = Player1.Position.Z - Speed
Player1.Movement.Z = Player1.Movement.Z - Speed
Player1.MoveCoordenates = Z
ScrollChanged
End If
If IsKeyDown(vbKeyDown) And KEY_DOWN Then
Player1.Position.Z = Player1.Position.Z + Speed
Player1.Movement.Z = Player1.Movement.Z + Speed
Player1.MoveCoordenates = Z
ScrollChanged
End If
End Sub
Last edited by joaquim; Jun 25th, 2020 at 03:26 PM.
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Jun 27th, 2020, 09:53 AM
#125
Thread Starter
PowerPoster
Re: 3D Math: how draw a 3D cube?
finally i fixed how i draw the plane:
1 - get all four vectors and rotate them;
2 - i test if the plane is drawed on camera, if not then exit the sub;
3 - else i test the bottoms vectors for drawed inside the camera.
4 - i draw them(here we can use the brush).
Code:
Private Sub DrawPlane(Position As Position3D, Size As Size3D, Rotation As Angle3D, WorldSize As Size3D)
Dim Points(4) As POINTAPI
Dim NewPoint As POINTAPI
Dim NewPosition3D(4) As Position3D
Dim RotatedPosition As Position3D
'Rotate from player position:
With Player1.Position
FillPosition3D RotatedPosition, .X, .Y, .Z 'Camera Position
End With
'Get the four vectors
'Floor:
'Vector1
FillPosition3D NewPosition3D(0), Position.X, Position.Y, Position.Z
NewPosition3D(0) = Rotate(NewPosition3D(0), Rotation, RotatedPosition)
'Vector2
FillPosition3D NewPosition3D(1), Position.X, Position.Y, Position.Z + Size.ZDepth
NewPosition3D(1) = Rotate(NewPosition3D(1), Rotation, RotatedPosition)
'Vector3
FillPosition3D NewPosition3D(2), Position.X + Size.Width, Position.Y, Position.Z + Size.ZDepth
NewPosition3D(2) = Rotate(NewPosition3D(2), Rotation, RotatedPosition)
'Vector4:
'getting the wrong vector X :(
FillPosition3D NewPosition3D(3), Position.X + Size.Width, Position.Y, Position.Z
NewPosition3D(3) = Rotate(NewPosition3D(3), Rotation, RotatedPosition)
'Testing if the plane is on screen:
If ((IsOnCamera(NewPosition3D(0), camera1.Position, camera1.Size) = False) _
And (IsOnCamera(NewPosition3D(1), camera1.Position, camera1.Size) = False) _
And (IsOnCamera(NewPosition3D(2), camera1.Position, camera1.Size) = False) _
And (IsOnCamera(NewPosition3D(3), camera1.Position, camera1.Size) = False)) Then
Exit Sub
End If
If (IsOnCamera(NewPosition3D(0), camera1.Position, camera1.Size) = False) Then
NewPosition3D(0) = GetInCamVector(NewPosition3D(0), NewPosition3D(1))
End If
If (IsOnCamera(NewPosition3D(3), camera1.Position, camera1.Size) = False) Then
NewPosition3D(3) = NewPosition3D(0)
NewPosition3D(3).X = NewPosition3D(2).X
End If
'Convert all 3D vectors to 2D vectors(for screen):
Dim i As Integer
For i = 0 To 3
Points(i) = ConvertPositon3DTo2D(NewPosition3D(i), WorldSize)
Next i
'change the brush and pen(i belive the pen can be transparent):
FillStyle = vbFSSolid
FillColor = vbRed
Polygon Me.hDC, Points(0), 4
End Sub
i will update these sub for get the brush and pen and then the angle3d will accept the rotation position.
heres the only problem is the camera size and position...
passel: please can you see my last topic for see the camera size and position?
http://www.vbforums.com/showthread.p...he-camera-size
if i click on max window button, the form will fill the screen area and the plane is drawed.. that's why i know that i have problems with camera size and position.
thanks for all
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