c - How do I subdivide a triangle in three dimensions? -

-

I have a function which takes 3 digits and I will use these points to draw a triangle, like I The glVertex was using the function.

But since I want to make this triangle a texture while avoiding perspective distortion, I have to divide it and use it for computation of texture mapping and normals.

I can not understand how to do this for a managed rectangle, spherical, cylinder and taurus, but for me, how to understand the triangle, for my life.

I have found every example of triangle mapping only for 2D space and by using glVertex, with predefined digits.

In the form of a rectangle, the code I am using is: 

  zero rectangle: draw float tex, float texts) {float x 1, X2, y1, y2; X1 = v.at (0); X2 = V.Att (2); Y1 = v.at (1); Y2 = v.at (3); // glRectf (x1, y1, x2, y2); Int _numDivisions = 100; Float _xDim = abs (x2 - x1); Float_yadim = ab (y2 - y1); Float textsmulti, taximultity; Tech Multitas = _xDim / texs; // / _xDim; Texmaltity = _yDim / texT; // / _yDim; GlPushMatrix (); GlTranslatef (x1, y1, 0); glRotatef (-90.0,1,0,0); GlScalef (_xDim * (1.0 / (Double) _numDivisions), 1, _yDim * (1.0 / (Double) _numDivisions)); GlNormal3f (0, -1.0); For (int bx = 0; bx & lt; _numdivisions; bx ++) {glBegin (GL_TRIANGLE_STRIP); GlTexCoord2f ((bx * 1.0 / _numDivisions) * taximultity, 0.0 * technocultics); GlVertex3f (bx + x1, 0, 0 + y1); (Int bez = 0; bg; ln; _numDivisions; bz ++) {glTexCoord2f (bx + 1) * 1.0 / _numDivisions) * Technistics, (bees * 1.0 / _num division) * Texmultity); GlVertex3f ((bx + 1) + x1, 0, bz + y1); GlTexCoord2f (((bx + 1) * 1.0 / _num division) * Technistics, ((bez + 1) * 1.0 / _num division) * Techniques Multititi); GlVertex3f (bx + x 1, 0, (bez + 1) + y1); } GlTexCoord2f ((bx + 1) * 1.0 / _num division) * Techniques, 1.0 * TechnicTTY); GlVertex3d ((bx + 1 + + x1, 0, _numDivisions + y1); glEnd (); } GlPopMatrix (); }   
 And it's getting me It is very easy, because it is in 2D space. I was aiming for the same kind of argument, but for a 3D space triangle.  
 But I can not understand the required calculation for the digits in the triangle in the 3D space.  
 For example:  
 P1-> (0,0,1); P2-> (1,0,0); P3- & gt; (0,1,0);  
 My best idea so far is to draw it originally with P1 in 2D space, I can just make every point in the P1-> P2 line, concentrate on P3, and Then calculate the angle of rotating angle according to the X-axis and then calculate the angle for rotation in the y-axis, but is this the best way to actually go?  
 Edit:  
 Being benevolent, there can be a way to re-write the question: "How can I divide a normal triangle in three dimensions" ?  
 Since the objective is to obtain an algorithm that creates a triangle in the triangle segment (triangle strip or tractor bar) in 3D space, I can use the corner for texture mapping and general calculation. As suggested in the comments, you can slice the triangle equal to a triangle  
 
 
 With some fancy ASCII art:  
  / | / | ---- / | / | / | / | ------- / | / | / | / | / | / | ---------- / | / | / | / | / | / | / | / | -------------   
 In this triangle strips, moving down from the top down, we will have 4 strips. The triangles of strips for 4 strips are:  
  1, 3, 5, 7   
 or  2 * i + 1  For strip  i , from  i  to  0  to  n - 1 .  
 To calculate the required verticals for the subdivision, you can calculate the digits on the bottom edge of the linear interpolation between the two edges. The only thing for the edges of the edges of the edges in diagram is diagonally. Then with each bar, you again make a linear interpolation between these two points, in the strip  i  in  i  on the left side of the pieces, and in  on the right Split i + 1  pieces.

Comments

Post a Comment

Popular posts from this blog

php - PDO bindParam() fatal error -

-
I am trying to learn PDO, now I have written this small code, but it gives me a serious error: < P> Fatal error: Call a member function at a non-object dot () ... $ con = new mysqli ("127.0.0.1", "root", "", "csvdangercheck"); $ Query = $ con- & gt; ("Id,` var1`, `var2`) values ​​(" id,: var1,: var2) ";); $ query- & gt; bypass pattern (': id', $ id); $ query- & gt; BindParam (': var1', $ VAL1); $ Query- & gt; bindParam (': var2', $ val2); $ Query-> Executed (); I Trying to use print_r ($ con-> errorInfo ()) but Fatal error: Undefined method mysqli :: errorInfo ( ) ... can someone tell me what am I missing? Flaffeh said, you have PDO Missing Mysqy, try it: $ con = new PDO ('mysql: host = 127.0.0.1; dbname = csvdangercheck', 'root', '');
Read more

logging - How can I log both the Request.InputStream and Response.OutputStream traffic in my ASP.NET MVC3 Application for specific Actions? -

-
For a specific set of tasks, I need to log in to the incoming request inputstream as well as outgoing response. is. I am using an ActionFilterAttribute for this and overriding the OnActionExecuted and OnResultExecuted methods. So I'm starting with this idea ... Public category ActionLoggerAttribute: ActionFilterArrbit {Public Override Zero On-Offed Execution (ActionActioned Contact Filter Filter) {base.OnActionAxecuted (FilterContext); HttpRequestBase request = filterContext.HttpContext.Request; // TODO: Log the request. InputStream} Public Override Zero OnResultExecuted (ResultExecutedContext FilterContext) {base.OnResultExecuted (filterContext); HTTPRPSPointBase Response = FilterContacts Hpptex response; // TODO: Log on Response.OutputStream}} Ideally I'll hook it up with enterprise library logging because I'm already using it for error logging. Am I reaching the input and output stream at the right time? Can I easily use the Enterprise Library to log i
Read more

java - Why my included JSP file won't get processed correctly? -

-
I am trying to create Java web framework (and learning), and on the basis of 'Code Generator In the process of making the material view of the database in the process of development, I stumbled into a difficulty, which I do not know how to solve it. First of all, I want the following index.jsp : & lt; Body & gt; Use all pages to be created. & Lt;% @ include file = "header.jsp"% & gt; & Lt; Hours / & gt; & Lt;% @ included file = "body.jsp"%> & Lt; Hours / & gt; & Lt;% @ include file = "footer.jsp"% & gt; & Lt; / Body & gt; And, in body.jsp , I should have it like this: & lt; Jsp: include page = "$ {Application_modul}"%> Where application_modul is an attribute defined in its controller: request.setAttribute ("application_modul", "USER_ACCOUNT \\ ' View_user_account.jsp "); This file can be found properly, but the processed JSP does
Read more