General Formula for Perspective Projection Matrix
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Can anyone please tell me what is the general formula to implement the Perspective Projection Matrix? I'm trying to implement a way to generate this matrix in order to use it for a game engine I'm working on.
math matrix graphics projection perspective
asked Nov 11 at 3:37
Pmsmm
248
add a comment |
up vote
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down vote
favorite
Can anyone please tell me what is the general formula to implement the Perspective Projection Matrix? I'm trying to implement a way to generate this matrix in order to use it for a game engine I'm working on.
math matrix graphics projection perspective
asked Nov 11 at 3:37
Pmsmm
248
there are more than one type of perspective matrix out there ... I am used to this one depth buffer got by glReadPixels is always 1 look forglPerspective
– Spektre
Nov 11 at 5:04
@Spektre I gave it a look but I'm still having a hard time figuring things out. But clarify this to me, a Perspective Projection Matrix isn't the product between a perspective matrix and a projection matrix? Or there's something else to it?
– Pmsmm
Nov 12 at 1:24
1
Yes you're right but the projection matrix to which you are multiplying the perspective matrix is usually unit matrix unless you want to simulate some special behavior. My matrix just preserve aspect ratio and re-map the z to logarithmic values (likegluPerspectivewould do)
– Spektre
Nov 12 at 7:18
I think I'm getting it, I'll try to do some further research but thanks for the help.
– Pmsmm
Nov 12 at 19:56
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
Can anyone please tell me what is the general formula to implement the Perspective Projection Matrix? I'm trying to implement a way to generate this matrix in order to use it for a game engine I'm working on.
math matrix graphics projection perspective
asked Nov 11 at 3:37
Pmsmm
248
Can anyone please tell me what is the general formula to implement the Perspective Projection Matrix? I'm trying to implement a way to generate this matrix in order to use it for a game engine I'm working on.
math matrix graphics projection perspective
math matrix graphics projection perspective
asked Nov 11 at 3:37
Pmsmm
248
asked Nov 11 at 3:37
Pmsmm
248
asked Nov 11 at 3:37
Pmsmm
248
asked Nov 11 at 3:37
Pmsmm
248
asked Nov 11 at 3:37
Pmsmm
248
248
there are more than one type of perspective matrix out there ... I am used to this one depth buffer got by glReadPixels is always 1 look forglPerspective
– Spektre
Nov 11 at 5:04
@Spektre I gave it a look but I'm still having a hard time figuring things out. But clarify this to me, a Perspective Projection Matrix isn't the product between a perspective matrix and a projection matrix? Or there's something else to it?
– Pmsmm
Nov 12 at 1:24
1
Yes you're right but the projection matrix to which you are multiplying the perspective matrix is usually unit matrix unless you want to simulate some special behavior. My matrix just preserve aspect ratio and re-map the z to logarithmic values (likegluPerspectivewould do)
– Spektre
Nov 12 at 7:18
I think I'm getting it, I'll try to do some further research but thanks for the help.
– Pmsmm
Nov 12 at 19:56
add a comment |
there are more than one type of perspective matrix out there ... I am used to this one depth buffer got by glReadPixels is always 1 look forglPerspective
– Spektre
Nov 11 at 5:04
@Spektre I gave it a look but I'm still having a hard time figuring things out. But clarify this to me, a Perspective Projection Matrix isn't the product between a perspective matrix and a projection matrix? Or there's something else to it?
– Pmsmm
Nov 12 at 1:24
1
Yes you're right but the projection matrix to which you are multiplying the perspective matrix is usually unit matrix unless you want to simulate some special behavior. My matrix just preserve aspect ratio and re-map the z to logarithmic values (likegluPerspectivewould do)
– Spektre
Nov 12 at 7:18
I think I'm getting it, I'll try to do some further research but thanks for the help.
– Pmsmm
Nov 12 at 19:56
there are more than one type of perspective matrix out there ... I am used to this one depth buffer got by glReadPixels is always 1 look for
glPerspective– Spektre
Nov 11 at 5:04
there are more than one type of perspective matrix out there ... I am used to this one depth buffer got by glReadPixels is always 1 look for
glPerspective– Spektre
Nov 11 at 5:04
@Spektre I gave it a look but I'm still having a hard time figuring things out. But clarify this to me, a Perspective Projection Matrix isn't the product between a perspective matrix and a projection matrix? Or there's something else to it?
– Pmsmm
Nov 12 at 1:24
@Spektre I gave it a look but I'm still having a hard time figuring things out. But clarify this to me, a Perspective Projection Matrix isn't the product between a perspective matrix and a projection matrix? Or there's something else to it?
– Pmsmm
Nov 12 at 1:24
1
1
Yes you're right but the projection matrix to which you are multiplying the perspective matrix is usually unit matrix unless you want to simulate some special behavior. My matrix just preserve aspect ratio and re-map the z to logarithmic values (like
gluPerspective would do)– Spektre
Nov 12 at 7:18
Yes you're right but the projection matrix to which you are multiplying the perspective matrix is usually unit matrix unless you want to simulate some special behavior. My matrix just preserve aspect ratio and re-map the z to logarithmic values (like
gluPerspective would do)– Spektre
Nov 12 at 7:18
I think I'm getting it, I'll try to do some further research but thanks for the help.
– Pmsmm
Nov 12 at 19:56
I think I'm getting it, I'll try to do some further research but thanks for the help.
– Pmsmm
Nov 12 at 19:56
add a comment |
1 Answer
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Ok so basically with some help from @spektre and a friend of mine I was able to figure out how to really do this. Pretty much the formula I used was this:
So pretty much what you need to make this matrix is a function that receives 4 arguments which are the following:
- zFar
- zNear
- Aspect Ratio
- Field of View
If you want to know more about these fields and the matrix itself my advice is to head over to WebGL 3D Perspective to actually see this working.
answered Nov 18 at 22:39
Pmsmm
248
add a comment |
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Ok so basically with some help from @spektre and a friend of mine I was able to figure out how to really do this. Pretty much the formula I used was this:
So pretty much what you need to make this matrix is a function that receives 4 arguments which are the following:
- zFar
- zNear
- Aspect Ratio
- Field of View
If you want to know more about these fields and the matrix itself my advice is to head over to WebGL 3D Perspective to actually see this working.
answered Nov 18 at 22:39
Pmsmm
248
add a comment |
up vote
0
down vote
Ok so basically with some help from @spektre and a friend of mine I was able to figure out how to really do this. Pretty much the formula I used was this:
So pretty much what you need to make this matrix is a function that receives 4 arguments which are the following:
- zFar
- zNear
- Aspect Ratio
- Field of View
If you want to know more about these fields and the matrix itself my advice is to head over to WebGL 3D Perspective to actually see this working.
answered Nov 18 at 22:39
Pmsmm
248
add a comment |
up vote
0
down vote
up vote
0
down vote
Ok so basically with some help from @spektre and a friend of mine I was able to figure out how to really do this. Pretty much the formula I used was this:
So pretty much what you need to make this matrix is a function that receives 4 arguments which are the following:
- zFar
- zNear
- Aspect Ratio
- Field of View
If you want to know more about these fields and the matrix itself my advice is to head over to WebGL 3D Perspective to actually see this working.
answered Nov 18 at 22:39
Pmsmm
248
Ok so basically with some help from @spektre and a friend of mine I was able to figure out how to really do this. Pretty much the formula I used was this:
So pretty much what you need to make this matrix is a function that receives 4 arguments which are the following:
- zFar
- zNear
- Aspect Ratio
- Field of View
If you want to know more about these fields and the matrix itself my advice is to head over to WebGL 3D Perspective to actually see this working.
answered Nov 18 at 22:39
Pmsmm
248
answered Nov 18 at 22:39
Pmsmm
248
answered Nov 18 at 22:39
Pmsmm
248
answered Nov 18 at 22:39
Pmsmm
248
248
add a comment |
add a comment |
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there are more than one type of perspective matrix out there ... I am used to this one depth buffer got by glReadPixels is always 1 look for
glPerspective– Spektre
Nov 11 at 5:04
@Spektre I gave it a look but I'm still having a hard time figuring things out. But clarify this to me, a Perspective Projection Matrix isn't the product between a perspective matrix and a projection matrix? Or there's something else to it?
– Pmsmm
Nov 12 at 1:24
1
Yes you're right but the projection matrix to which you are multiplying the perspective matrix is usually unit matrix unless you want to simulate some special behavior. My matrix just preserve aspect ratio and re-map the z to logarithmic values (like
gluPerspectivewould do)– Spektre
Nov 12 at 7:18
I think I'm getting it, I'll try to do some further research but thanks for the help.
– Pmsmm
Nov 12 at 19:56