TheGameCreators - CodeBase - Creating / modifying objects using memblocks.

Return to the CodeBase listing

Category: Memblocks

Version: 1.0

Information

Uploaded: 31st Aug 2003 10:58

Modified: 31st Aug 2003 11:01

Author: Rob K

Summary

Shows the basics of creating and modifying objects at a very low level.

Full Description

Using memblocks, you can modify the position / normals of individual verticies (the points which are linked together to form the faces of an object). You can also adjust UV texture co-ordinates (which specify how textures are mapped to the object), and adjust the color and alpha components of individual verticies (useful for making the end of a beam fade out for example). <br /> <br /> This code shows you how to create and manipulate a very simple primitive.

DarkBASIC Professional Source Code

` This code was downloaded from The Game Creators

` It is reproduced here with full permission

` http://www.thegamecreators.com

sync on: sync rate 0

rem setting the triangle vars

polys=1

x1#=-3.0 : y1#=2.0 : z1#=1.0

x2#=3.0 : y2#=2.0 : z2#=-1.0

x3#=-1.0 : y3#=-1.0 : z3#=0.0

rem make the memblock with the right size (Each poly has 3 vertices with 36 bytes of data each)

rem plus another 12 bytes for the header

make memblock 1,(polys*3*36)+12

rem write the header

rem FVF format (4 bytes, so a dword) this is normally 338

write memblock dword 1,0,338

rem FVF size (in this case 36 bytes)

write memblock dword 1,4,36

rem Number of vertices

write memblock dword 1,8,polys*3

rem writing data for the first vertex

rem position (3 floats(float=4 bytes) for the x,y and z position of the vertex point)

write memblock float 1,12,x1#

write memblock float 1,16,y1#

write memblock float 1,20,z1#

rem normal (again 3 floats) we well set it so each vertex point faces the camera (not normal)

write memblock float 1,24,0

write memblock float 1,28,0

write memblock float 1,32,-1.00

rem color (as a dword, or as 4 bytes blue,green,red,alpha)

write memblock dword 1,36,rgb(255,0,0)

rem UV texture coordinates (2 floats) doesn't matter for now, because we don't give it a texture

write memblock float 1,40,0.00

write memblock float 1,44,0.00

rem writing data for the second vertex

rem position (3 floats(float=4 bytes) for the x,y and z position of the vertex point)

write memblock float 1,12+36,x2#

write memblock float 1,16+36,y2#

write memblock float 1,20+36,z2#

rem normal (again 3 floats) we well set it so each vertex point faces the camera (not normal)

write memblock float 1,24+36,0

write memblock float 1,28+36,0

write memblock float 1,32+36,-1.00

rem color (as a dword, or as 4 bytes blue,green,red,alpha)

write memblock dword 1,36+36,rgb(0,255,0)

rem UV texture coordinates (2 floats) doesn't matter for now, because we don't give it a texture

write memblock float 1,40+36,1.00

write memblock float 1,44+36,0.00

rem writing data for the third vertex

rem position (3 floats(float=4 bytes) for the x,y and z position of the vertex point)

write memblock float 1,12+72,x3#

write memblock float 1,16+72,y3#

write memblock float 1,20+72,z3#

rem normal (again 3 floats) we well set it so each vertex point faces the camera (not normal)

write memblock float 1,24+72,0

write memblock float 1,28+72,0

write memblock float 1,32+72,-1.00

rem color (as a dword, or as 4 bytes blue,green,red,alpha)

write memblock byte 1,36+72,0

write memblock byte 1,36+73,0

write memblock byte 1,36+74,255

write memblock byte 1,36+75,0

rem UV texture coordinates (2 floats) doesn't matter for now, because we don't give it a texture

write memblock float 1,40+72,0.50

write memblock float 1,44+72,1.00

rem make a mesh out of this memblock

make mesh from memblock 1,1

rem make an object with this mesh

make object 1,1,0

position camera 0,0,-10

set object transparency 1,1

text 20,40,"Screen FPS: " + str$(Screen FPS())

sync

loop

Download

Please login to download

Comments

No comments yet.

Author Name:	Rob K
CodeBase Entries:	5

CodeBase - Creating / modifying objects using memblocks.

Information

Summary

Full Description

DarkBASIC Professional Source Code

Download

Screen Shot

Author

Comments