• Announcements

    • khawk

      Download the Game Design and Indie Game Marketing Freebook   07/19/17

      GameDev.net and CRC Press have teamed up to bring a free ebook of content curated from top titles published by CRC Press. The freebook, Practices of Game Design & Indie Game Marketing, includes chapters from The Art of Game Design: A Book of Lenses, A Practical Guide to Indie Game Marketing, and An Architectural Approach to Level Design. The GameDev.net FreeBook is relevant to game designers, developers, and those interested in learning more about the challenges in game development. We know game development can be a tough discipline and business, so we picked several chapters from CRC Press titles that we thought would be of interest to you, the GameDev.net audience, in your journey to design, develop, and market your next game. The free ebook is available through CRC Press by clicking here. The Curated Books The Art of Game Design: A Book of Lenses, Second Edition, by Jesse Schell Presents 100+ sets of questions, or different lenses, for viewing a game’s design, encompassing diverse fields such as psychology, architecture, music, film, software engineering, theme park design, mathematics, anthropology, and more. Written by one of the world's top game designers, this book describes the deepest and most fundamental principles of game design, demonstrating how tactics used in board, card, and athletic games also work in video games. It provides practical instruction on creating world-class games that will be played again and again. View it here. A Practical Guide to Indie Game Marketing, by Joel Dreskin Marketing is an essential but too frequently overlooked or minimized component of the release plan for indie games. A Practical Guide to Indie Game Marketing provides you with the tools needed to build visibility and sell your indie games. With special focus on those developers with small budgets and limited staff and resources, this book is packed with tangible recommendations and techniques that you can put to use immediately. As a seasoned professional of the indie game arena, author Joel Dreskin gives you insight into practical, real-world experiences of marketing numerous successful games and also provides stories of the failures. View it here. An Architectural Approach to Level Design This is one of the first books to integrate architectural and spatial design theory with the field of level design. The book presents architectural techniques and theories for level designers to use in their own work. It connects architecture and level design in different ways that address the practical elements of how designers construct space and the experiential elements of how and why humans interact with this space. Throughout the text, readers learn skills for spatial layout, evoking emotion through gamespaces, and creating better levels through architectural theory. View it here. Learn more and download the ebook by clicking here. Did you know? GameDev.net and CRC Press also recently teamed up to bring GDNet+ Members up to a 20% discount on all CRC Press books. Learn more about this and other benefits here.
Sign in to follow this  
Followers 0
db123

how to make View Matrix and Projective Matrix for reflection by a plane.

2 posts in this topic

I want to render water surface

when i render the scene, use this matrix, it render the whole scene, include the object under the water.
so, when i use this render target as a shader resource view, it looks like this:
[attachment=7544:???.jpg]

I find some materials in google, they said I must create a new projective matrix, which is used to make the plane to be the near clip plane.
[img]http://public.gamedev.net//public/style_emoticons/default/rolleyes.gif[/img]
I want to clip the primtive which is under the water( the reflection plane).
I want to know how to creat this skewed projection matrix form the reflection plane and the original projective matrix.

or other there are other measures..[img]http://public.gamedev.net//public/style_emoticons/default/sad.png[/img] [img]http://public.gamedev.net//public/style_emoticons/default/sad.png[/img] [img]http://public.gamedev.net//public/style_emoticons/default/sad.png[/img]
\

[size=5][color=#ff0000]I have resolved matrix problem.[/color][/size]
0

Share this post


Link to post
Share on other sites
I get it:

left hand:
[CODE]
void CCamera::SetClipPlane(const CPlane& WorldClipPlane)
{
CMatrix4x4 ClipProjectionMatrix(m_ViewProjectionMatrix);

CPlane Plane(WorldClipPlane);
Plane.Normalize();
ClipProjectionMatrix.Invert4x4();
ClipProjectionMatrix.Transpose();
CPlane ClipPlane(Plane);
ClipPlane *= ClipProjectionMatrix;
if(ClipPlane.w == 0)
return;
if (ClipPlane.w > 0)
{
ClipPlane.x = - Plane.x;
ClipPlane.y = - Plane.y;
ClipPlane.z = - Plane.z;
ClipPlane.w = - Plane.w;
ClipPlane *= ClipProjectionMatrix;
}
ClipProjectionMatrix.Identity();
ClipProjectionMatrix._13 = ClipPlane.x;
ClipProjectionMatrix._23 = ClipPlane.y;
ClipProjectionMatrix._33 = ClipPlane.z;
ClipProjectionMatrix._43 = ClipPlane.w;
m_ProjectionMatrix *= ClipProjectionMatrix;
m_bIsTransformDirty = true;
}
[/CODE]

right hand:
[CODE]
inline float sgn(float a)
{
if (a > 0.0F) return (1.0F);
if (a < 0.0F) return (-1.0F);
return (0.0F);
}

void ModifyProjectionMatrix(const Vector4D& clipPlane)
{
float matrix[16];
Vector4D q;
// Grab the current projection matrix from OpenGL
glGetFloatv(GL_PROJECTION_MATRIX, matrix);

// Calculate the clip-space corner point opposite the clipping plane
// as (sgn(clipPlane.x), sgn(clipPlane.y), 1, 1) and
// transform it into camera space by multiplying it
// by the inverse of the projection matrix

q.x = (sgn(clipPlane.x) + matrix[8]) / matrix[0];
q.y = (sgn(clipPlane.y) + matrix[9]) / matrix[5];
q.z = -1.0F;
q.w = (1.0F + matrix[10]) / matrix[14];

// Calculate the scaled plane vector
Vector4D c = clipPlane * (2.0F / Dot(clipPlane, q));

// Replace the third row of the projection matrix
matrix[2] = c.x;
matrix[6] = c.y;
matrix[10] = c.z + 1.0F;
matrix[14] = c.w;
// Load it back into OpenGL
glMatrixMode(GL_PROJECTION);
glLoadMatrix(matrix);
}
[/CODE]
0

Share this post


Link to post
Share on other sites
[img]http://public.gamedev.net//public/style_emoticons/default/mellow.png[/img] [img]http://public.gamedev.net//public/style_emoticons/default/mellow.png[/img] when i apply a wave on the water surface, the clip projection matrix is not working.
[img]http://public.gamedev.net//public/style_emoticons/default/sad.png[/img] the inverted image is break up.
0

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0